When one takes a marshmallow and rests it on anothers anus, and then forcefully insterts it using a penis. This continues until the anus is almost completely filled with marshmallows.
Marshmallow creme may be used as lubrication, but anal lube is a definite no go, since the marshmallows will eaten out of the asshole afterwards.
"Hey what do you want to do tonight?"
"Ohhh I suppose we could try Marshing..."
"Yes! Let's do it!"
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