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When one bends a girl over and protrudes said girl's anus with one's member while said girl is projectile vomiting (or just vomiting) out of a window, preferably the second story or higher.

Note: still counts if it is good 'ole doggy style

Origin: was first performed at a Sigma Nu Fraternity house
"She was so drunk that I had to sigmaneuver her last night!"
by hippanonomouss February 19, 2008
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