lesbian sex; the act of two vaginas bumping against one another during sexual intercourse, usually accompanied by the splattering of a white, creamy fishy fluid. (See: bumpin uglies).
By the looks of the stains on the carpet, someone had spilt a dish of creamy alfredo seafood-but it was just the juices from your mom and her girlfriend clam smacking in the living room.
This is what my friends and I like to call "Lady Sex". Basically it's dirty lesbian sex. Also see "Clam Smacker"...One who does the clam smacking.
"Last night this hot chick came over and we were totally clam smacking"