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1. clam slam
The female version of teabagging in which the vagina is placed on one's face, usually to establish dominance. Frequently used by female video game players after fragging another player.
DUDE! K1LL3rClam83 just clam slammed me after she stuck me with a grenade!
2. Clam Slam
1. (v.) When one female prevents another female from scoring on a professional and/or personal level.

2. (v.) Female equivalent of cock block.

Synonyms: Twat swat; clam dam; clam jam (not to be mistaken for rag).
I was just about to close the deal when she cut in, cut me off and clam slammed me so hard I got whiplash. So...I punched her in the vag.
3. Clam Slam
Picking a Female up by her vagina and brutally slamming her into the ground. Also known as a pussy piledriver.
Sam: Dude your friend was pissing me off, so i had to Clam Slam Her
Jake: Its okay man, Should of thrown a kettle at the bitch
4. Clam Slam
The female version of tea bag
Shut up before I Clam Slam you
5. clam slam
Surprise-thrusting a cunt into the face!
I'd just had a clean shave and shower and was ready to have a lovely night out when a bitch from the hood Clam Slammed my ass and I had to wash the slimey splatter off my face.
6. clam slam
The female version of the "bag tag" when one person (usually female) hits another in the vagina.
"hey girl! what's up?"
(vagina hit)
"Clam Slam!!!"
7. Clam Slam
The female version of being cock-blocked. Another party ruins, prevents or impedes the probability of getting laid through whining, forcing to leave, laying the guilt trip and/or expecting one to "be a good friend" and sleep alone.
Almost everyone was hooking up in Mexico, until Trisha pulled the clam slam on me when she wasn't getting any play herself.