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1.
A mongolian wedgie is defined by the action of taking a person's nutsack and stretching it over their anus and stapling it in place

It can be done as an act of hazing or be used as a form of rhetoric to imply that something is really stupid.
1. I am going to give that piece-of-shit Dave a Mongolian Wedgie for sleeping with my girlfriend while I was sleeping with his.

or

2. I could run around the block to get next door, or I could stretch my sack over my anus and staple it down (Mongolian Wedgie)... but that wouldn't make sense, would it? Fucker.
by Joe the sackminister March 13, 2011