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8.
The buttonned up flap of fabric on the rear of old fashioned red long john's
I had to go so bad, I barely had time to unbutton my shit flap and get outta the tent!
by Long Jim September 29, 2005
 
9.
The festering labia of unkempt female genatalia.
"Did you go down on her?"
"No, she had shitflaps didn't she?!"
by Rudolph Munchnikker May 31, 2005