Top definition
To take a rather large dump upon. Mcnabby can also be said in a very excited tone, to mean somthing sexual that has nothing to do with feces.
i.e.- "Hey Kevin!"
"Hi Mike!"
"I'm gonna Mcnabby on your forehead!!"
"EXCELLENT!!!!!"
by GolgiBodies October 17, 2006
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The vengeful act of crapping on a lover's chest while they sleep.

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