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2.
TO FUCKING MUNCH ON SOMEONES HUGE ANUS HOLE.
"Man, I wanna munch on someones huge butt anus hole" - Butt Munching
by Andrew and Owen August 17, 2008
 
1.
Using the internet excessively to the point of addiction 'I've been butt munching all day'.

Some who engages in excessive butt munching is a butt munch, and they device they use is often a giant butt munching machine (a phone or an ipod is just a butt muncher).
That little butt munch has been butt munching on his giant butt munching machine for 3 days straight.
by Jujulovesdudu May 05, 2013