look up any word, like blumpkin:
"Do we have marshmallows for the campout tonight?"

"No, Kara took them all so she could make Marshmallow Surprise."
by GS 882 August 23, 2008
A sex act where midway through intercourse the male defecates into a sock and shoves it into the females mouth.
guy: dude I gave my girlfriend a marshmallow surprise
guy2: nasty
by [Nex] February 22, 2009