The air gap between a ladies inner thigh.
Damn, bro your girlfriend has a nice clam vent. She must work out a lot. I bet her pussy don't stank at all.
by MON icker December 9, 2013
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The act of having sexual intercourse in a ventilation duct.
I went vent thumping with my girl last night at the theater
by swagydefiner February 2, 2017
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