mongolian moon tube

Pertaining to the action of inserting ones penis into a banking vacuum tube which gives a sensation of a close encounter of the third kind.

Man: "Did you go to the bank today?"
Man 2: "Yea. It will be my last deposit"
Man: "A Mongolian Moon Tube?"
Man 2: "Johnny Bench called."

by Dougar Bait September 28, 2009