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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.
Related Words

Clam Bake 

The occurrence of a social situation, in which females greatly outnumber or completely out number the male population. For instance like a party, wine and cheese party, baby shower, Tupperware party, or other social interaction in which females are numbered in majority.
The opposite of a sausage fest. "Wow this wine tasting is such a Clam Bake"
Clam Bake by wildhorsefh November 5, 2009

clam shack 

Slang term for brothel. word brothel word whorehouse
Hey let's go to Costa Rica and hit the clam shacks. Buy lots of rubbers. Don't drink the water or eat the crab salad.
clam shack by Mattyboyee May 28, 2003

clam bake 

A party at which clams are baked
Hey timmy, are you going to the clam bake down at Willer's point?

Gosh no, I'm gonna go impregnate my girlfriend and snort coke.

clam bitch 

a person who keeps contained and quiet, also keeps things to themselves.

and once they decide to open up and talk... all they do is be a bitch

thus clam bitch
guy 1: dude i havent heard chelsea say anything in months

guy 2: yeah i know bro, shes a clam bitch. one minute shes quiet the next shes a bitch
clam bitch by chex March 17, 2008

Clam breather 

a blow job with a twist..... the person giving the head has a mouth full of egg salad.
Aw man my girl got kinky last night. She gave me a clam breather, extra paprika.