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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??"
von StreetBikeTakeover 14. Juni 2009
 
2.
A term used to describe the act of lesbianism
Mellisa and Sarah were engaged in a hot and steamy clambump.
von Jeff Mills 7. Juli 2006
 
3.
Another term for scissoring.
Hey babe, wanna clam bump?
von King Clam Bump 21. Juli 2013