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1.
The often confusing bulge on some womens pants, commonly mistaken for a penis bulge.
"Yo Nick, did you see Patty on register 7?"
"Bro, idk if thats a girl or not, did you see that clambump??"
Por StreetBikeTakeover 14 de junio de 2009
 
2.
A term used to describe the act of lesbianism
Mellisa and Sarah were engaged in a hot and steamy clambump.
Por Jeff Mills 07 de julio de 2006
 
3.
Another term for scissoring.
Hey babe, wanna clam bump?
Por King Clam Bump 21 de julio de 2013