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1.
(v.) to jump up and down whilst sitting on someones knee.
Also Bumbi-ing
-Jumping up and down on someones knee-
"I like it when you bumbi me"
by Reppin'upRM12 November 17, 2008
 
2.
A cool chick that plays bootleggers.
BUMBI is cool she is the bootlegging chick
by topdog523909 April 14, 2006