When two women aggressively rub their vulvae together during sexual intercourse.
"Stacey, do you want to go to spinning class with me?"
"No way, I was up all night clam slamming with Melissa, and my crotch is on fire."
1) I am totally going to clam slam her while she's sleeping.
2) You guys going clam slamming on Sunday?
The act of two females putting themselves between each others' legs to pound thier genitalia together for mutual sexual satisfaction.
Those two girls look happy. I bet they spent the whole night clamslamming.
The female version of cock blocking
. To hinder ones female associate from getting any action
whether accidential or intentional.
"I talked to the tool
for a damn hour only to have clam slamming Rhianne go make out with him in the corner."
"I hate it when Cindy gets drunk.. she turns into such a clam slammer."