I really hope you don't know m's definitions

marshmallow your mum

A very bad insult originally made up by the online entertainer (not porn) Philip Michael Lester. Is often said with little or no context. Is said to never be looked up on Urban Dictionary.

Dan: "I'll hide the marshmallows down your throat
Phil: "I'll marshmallow your mum"
Dan: "im sure that's a disgusting sex act, right there."
Phil: "don't look that up on Urban Dictionary"

by I really hope you don't know m November 1, 2017