Top Definition
one who nibbles butts.
a person who is a wicked dork, dufus, and moron.
Harry Potter, you big tosser, don't be such a buttnibbler.
by manz13 January 03, 2010
Someone who prefers to stick their tounge in the wrong orriface...
Shut up Worm you Butt Nibbler
by Kelly February 05, 2004
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