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"

Mouth Mongoling by A Drunken Sailor July 19, 2016

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Outer Mongolia

When someone has arrived who is very late or when someone gives you an ETA that is extremely long considering they don’t live far away

Where are you coming from, Outer Mongolia?

Where have you come from? Outer Mongolia?

Outer Mongolia by MilliesCookie November 27, 2021

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Mongolian Cluster Fuck

A group of horny Mongolians fucking(a Mongolian orgy)

Originally used by George Carlin, A commedian

I saw a Mongolian cluster fuck at the side of the road.

Mongolian Cluster Fuck by Matt, Bryce, Fag January 10, 2008

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