When a girl is kissing a guy for the first time and while kissing, the girl bites the guy while kissing because of the sudden shock and feels extremely embarrassed, and tells their Greek/Persian friend about it :)
Gaddy was at the movies with her BF, and when he slipped the tongue Gaddy couldnt help but BITE back.
Used in graffiti, as with the other definitions, it is to steal someones idea/style. Used by true hip-hop loving graffiti heads, the guys that have skill and have the right to critique others work. Not the gangs of filth that spread their messy skribble tags and would die if they ever attempted to design a piece.
'Damn skarab totally bit Rats style' Or 'That piece is a bite off Rats style if I ever saw one'
In an extreme case one may bite your tag name, esp. if you have built a name for yourself.