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1.
Title given to a friend or roommate who is assumes the role of "wingman" without him knowing due to the fact that he's sleeping or in a state of unconsciousness.
Dude!

Daniel has earned the official title of "sleeping wingman" due to the fact that I brought 2 girls over last night, and only one of the was hot, he took one for the team without even knowing what he was getting himself into

"HE IS THE SLEEPING WINGMAN"
by aacruzz February 07, 2010