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2 definitions by Caffeinejunky

 
1.
Most commonly used at restaurants: codeword for uncooked chicken that is either going bad, or is already decaying. It will often have a greenish tint and smell of dirty socks.
Bill: "We've got a bad case of greenbird in here, Boss."
Boss: "Well, we better sell it quickly then."
by Caffeinejunky October 31, 2006
 
2.
The result in a long day of swimming in a lake, river or ocean. The bum will be sore from being water logged and chafed by sand and/or rocks. It feels as if your bum is about to literally rot off.
Jim: "Oh dear, I've caught a rather mild case of bumrot."
by Caffeinejunky November 01, 2006