Top definition
1. staggeringly irritating behaviour over a significant period of time.

2. a single act of infuriating or stupid behaviour, so serious it can be likened to a crime.
I've been committing buttmunchery all afternoon.

They sometimes dabble in buttmunchery.

I've been a victim of my son's buttmunchery.
by errochtybuttmeisters July 30, 2011
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