Clam-block 

Verb. Female equivalent to "cock-block." A clam or vagina is blocked from being entered; when intercourse is blocked from said female by her girlfriend(s), long term friend zone male, competing and less desired male, or act of god.

Still in the throes of post-break-up depression, Sally clam-blocked Becky at the party, so she wouldn't have to watch Gilmore Girls and cry into a bag of Dorritto flavored icecream alone.

Clam-block by roadrunner23 November 30, 2014

Clam Blocker 

A single girl's friend, usually male, that prevents any other guys from flirting with her or asking her out - the female equivalent to the male term, cock blocker.

Hey girl, you should really stop going out with your friend, Greg. You'll never get any numbers cause he's a clam blocker!

Clam Blocker by Dr. Starf*cker May 27, 2011

Black Clam 

A Black clam is a vagina on any women of African descent. It is called so because a female vagina looks like a clam and a darker colored ones are called "Black clam".

Jose walks into the Tijuana whorehouse and tells the Madam, "Senora, you have a lot of pretty Latinas in here but I had my heart set on getting some Black Clam." The madam goes to the back and pulls out a dark Panamanian lady of the night. Jose pays the madam $10 and has his share of that sweet Black Clam!

Black Clam by ElChorizero June 12, 2011

clamblocking 

When a woman wants a man and another woman steps in front and gets him.

A woman in a bar sees a man and wants to pick him up and before she can another woman comes clamblocking and picks him up.

clamblocking by rmcardz February 23, 2011