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!!!!!"
GolgiBodiesによって 2006年10月17日(火)

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