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The act of pleasuring two men at the same time, without either of them knowing about the other. Simply put, the woman kneels within a large dogflap (like a catflap in a door, only larger), and men 'take' her from either end, without being able to see each other.
I was out in Oxford last week, and saw STFCBird dogflapping two tramps in Argos, near Bonn Square.
by Tramp#1 August 06, 2004
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