usually used by dorks who want to be cool.
its a word used like "dude" or "brotha"
most ppl who say it also say "fo-shizzle" and "GANGSTA" is the whitest way possible!
it is also what some ppl call asian ppl, but mostly it is just another word for "dude"
it also can be used like "sex: or "bomb" otherwise known as awesome.