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when someone is agreeing with what someone else is saying. Also could be used in the beginning of a sentence if the person talking is excited because they know what they are talking about.
"Damn dude, he was acting crazy today"..
"word n shit, yea he was."

"i was at the mall and i went into Man Alive, and they were having this big ass sale.."
"oh w0rd n shit!! yea i went there too and bought so much..blah blah"
by Erica* May 03, 2005