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1.
Refers to the hole in the crotch of men's pajama pants.
"Being female, I had to sew up the man gap in my pajama pants."

"On cold winter nights when urination is imminent, men are fortunate enough to have outdoor plumbing, so there is no need to pull their pants down and freeze. They can simply use the man gap in their pajama pants."
by Morrighainne MacHealey January 17, 2010