Mouth Mongoling is when two people are kissing and the lips of one goes inside the mouth of the other. This action is repeated for both sides. Mouth Mongoling is also seen as when someone's mouth goes inside the other person's mouth while kissing.
Mark and Jessica were Mouth Mongoling last night.
OR
Guy 1: "Hey Dude, Mark and Jessica were Mouth Mongoling last night!"
Guy 2: "wow"
OR
Guy 1: "Hey Dude, Mark and Jessica were Mouth Mongoling last night!"
Guy 2: "wow"
by A Drunken Sailor July 19, 2016