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1.
Marshmallows that an extremely attractive female deficates when a man hits her G- Spot during sexual intercourse; may occasionally taste like cellery.
Dude, check this shit! When I was boning your sister last night, she came so hard she totally busted a buttmallow!
by Thisus A. S. Yudonum April 22, 2009
13 4
 
2.
The two cheeks making up one's ass. Buttocks.
Kathleen was too busy toasting her buttmallows by the fireplace to worry about the ringing phone.
by Boozy Tang December 12, 2007
1 1