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The act of stuffing a marshmallow up a girls asshole, and then proceeding to fuck the marshmallow deeply inside her, like one was loading an old civil war musket. Then upon finishing inside said asshole, the female is asked to evacuate the contents upon two eagerly waiting graham crackers. It is considered rude if the cracker is not consumed afterwards.
"Last night my girlfriend made me give her a Colorado Campfire. It was delicious."
by Dolphin_Trombone October 17, 2016
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