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1.
when someone is eating a lot.
damn man you munchin you ate like 4 bags of platano chips.
by caca poopoo July 31, 2006
 
2.
1. A term for performing gay oral sex.

2. A term for performing oral sex.

3. The action of eating food.
What were you doing last night? Munchin?
by Mickwill February 24, 2011