WRITER
Practitioner of the art of graffiti.

PIECE
A graffiti painting, short for masterpiece. It’s generally agreed that a painting must have at least three colors to be considered a piece. TO PIECE - To paint graffiti, creating a piece, not just go out tagging.

CREW
A loosely organized group of writers who also tag the crew initials along with their name. Crew names are usually three letters, many times ending with “K”, which stands for “kings” or “kills” in most cases. Some crew names are just two letters, some are four, it all depends.

CHARACTER
A cartoon figure (usually, but not necessarily) taken from comic books, TV or popular culture to add humor or emphasis to a piece. In some pieces, the character takes the place of a letter in the word.

TAG
The most basic form of graffiti, a writer’s signature with marker or spray paint. It is the writer’s logo, his/her stylized personal signature. If a tag is long it is sometimes abbreviated to the first two letters or the first and last letter of the tag. Also may be ended with the suffixes “one”, “ski”, “rock”, “em” and “er”.

TAGGER
As opposed to “writer”; this term is usually used to refer to those who only do tags and throwups and who never piece. Some taggers seem to like more destructive methods such as scribers and sandpaper in addition to markers and paint. Some taggers do get interested in piecing, some don’t. Taggers who never piece are sometimes called “scribblers” by more experienced, piecing writers.

OUTLINE
The drawing done in a piecebook in preparation for doing the actual piece. Also called a sketch. Can also refer to the outline put on the wall and then filled, or the final outline done around the piece to finish it.

THROWUP
Over time, this term has been applied to many different types of graffiti. Subway art says it is “a name painted quickly with one layer of spray paint and an outline”, although some consider a throwup to be bubble letters of any sort, not necessarily filled. Throwups can be from one or two letters to a whole word or a whole roll call of names. Often times throwups incorporate an exclamation mark after the word or letter. Throwups are generally only one or two colors, no more. Throwups are either quickly done bubble letters or very simple pieces using only two colors.

BOMB
Prolific painting or marking with ink. To cover an area with your tag, throwups, etc.

TOY
An inexperienced or incompetent writer. Someone whose writing is either wack, who uses sucker tips, or whose style is just plain cheesy. One old definition of “TOYS” is that it stands for “trouble on your system”.

OLD SCHOOL
General term used to refer to the early days of writing, more specifically, the mid 70s to ‘82 or ‘83. Also may refer to hip-hop music of this period. Old-school writers are given respect for being there when it all started, and specific writers are remembered for creating specific styles. For example, Blade and Comet created blockbusters, Phase 2 created bubble letters, clouds, Skeme’s “S”, and so on.

WILDSTYLE
A complicated construction of interlocking letters. A hard style that consists of lots of arrows and connections. Wildstyle is considered one of the hardest styles to master and pieces done in wildstyle are often completely undecipherable to non-writers.

BATTLE
This is done when two writers or two crews have some sort of disagreement. The battle can take two forms: skills battle or getting up - essentially quality vs. quantity. A skills battle is when two writers piece a wall within a certain time period (usually a day or a few hours) and whoever does the best piece is the winner. A getting-up battle is when the writers take a certain area of a city and whichever crew can get up the most in that area within a certain amount of time (say a week to a month), wins. For both kinds of battle, an outside crew or writer judges who is the winner. The terms of losing and winning are usually negotiated by the crews involved and can be payment in paint, pot, a sock in the jaw, the losing crew has to stop writing their name, etc., etc.

FRESH
New, cool, good. An early hip-hop term.

HIP HOP
The culture in the late 70s and early 80s that spawned the graffiti culture as we know it now, breakdancing and hip-hop music, which has since turned into modern rap music.

MURAL
A large-scale type of piecing, done top to bottom on a wall; usually a large production involving one or two pieces and usually some form of characters.

PROPS
Respect, comes from “proper respect”. From hip-hop/rap.

STICKERS
A form of tagging, most commonly saying “Hello, my name is”. Can be anything from computer-generated, clear, generic blank stickers that have the writer’s name on them to elaborate stickers with little pieces and characters. Some writers consider stickers to be for people who are “afraid” to use markers/paint, while other writers use a combination of stickers with markers and paint.

source: http://graffiti.org/faq/graffiti.glossary.html