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1.
A monkey's naughty bits. The part of the monkey that you don't want to see.
That monkey was touching his monkey bumbles in front of the kids.
by jasoninalbany May 30, 2008
 
2.
To punch some one in the back of the head.
When your fucking a girl from behind, you monkey bumble her in the back of the head as hard as you can, then fuck her in the ass
by that kid righht there August 05, 2006