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1 definition by Dan Kisielewski

 
1.
A greeting cultivated originally by a New Jersey FFA (Future Farmer's Of America) chapter; used by people on the street to identify friends or to intimidate geeks/losers/etc. Is answered with a chorus of "yeah, yeah!"
Cool Guy: "What about bumpin'?"

Random Person: "Um..."

Cool Guy: "What about bumpin'?"

Cool Person: "Yeah, yeah!"
by Dan Kisielewski October 14, 2006