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1.
a word used to insult someone with no real meaning like dinkus or swashbucket
shutup Alanna, you butmuncher!
by Punna June 13, 2004
 
2.
A homosapien who consumes the gluteus maximus of human beings.
Krystal is a butmuncher because she was eating someones but.
by Kriss&Te April 14, 2008