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2.
A combination of the words "Mount" and "Pounce" typically referring to a sexual activity.
I mounced Tesla last night.
by Gillag April 20, 2008
 
1.
1. To fuck something up beyond recognition.
2. Backwoods retard
1. Goddamnit! That stupid asshole mounced my whole day!
2. Don't be such a mounce, dude.
by Clit Eatswood December 31, 2005
 
3.
1. v.t.: literally, mouse sex
At first Charlotte thought the field mice were wrestling; on examining the little darlings more closely she found to her dismay that they had begun to mounce.
by H. Babbit March 11, 2011