In the film industry, it refers to a clothespin. Often used by the lighting department to attach gels to lights, keep cords out of the way, etc.
A: Hey new guy...hand me a c47.
B: *blank stare*
A: C47! *sigh*...a clothespin!
b: Oh.
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In hop-hop, it's often used as a sort of taunt after a proclamation has been made.
South side runnin' this bitch! What!
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What happens when you're riding your bike and you shift gears too fast or incorrectly. (The "chain" comes off the spokes)
Person A: Yo man, don't be ridin' all fast and shiftin' gears like woah, yo' bike is off the chain!
Person B: Word?
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Extreme props to someone for doing something totally appreciated. Invented in the rec.music.hip-hop Usenet group back in 1997.
Thanks for sending that file to me, you get MEGADAPS!
Someone who lives in Los Angeles.
A: There sure are a lot of LAliens here!
B: Uhh, this is a Lakers game.
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Someone who comes from or lives in Los Angeles.
A: Man, there sure are a lot of LAliens here tonight!
B: This is a Lakers game, you retard.
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