Clam Up 

To suddenly keep unusually quiet, often in regards to the divulging of information.

Carol clammed up about the incident at the bakery, so we never did find out whatever happened to Nate.

Clam Up by Diggity Monkeez April 30, 2005

Clam Up 

When a girl who seems interested suddenly decides that she will not have sex.

"Hey girl, I thought we were going to get down. Why you gotta clam up on me?!"

Dude, this chick was all over me and then she totally clammed up!

Clam Up by gravytrain21 July 20, 2014

clam up 

Like tea bagging, but when a girl does it, ie a passed out young man has a photo taken with a woman's naked vulva on his face.

OMG, he got so wasted last night and Vickie said that she was going to clam up, and she totally clammed him up. Check out the photo on Flickr!

clam up by Cal952qCal February 27, 2009

clam up 

to tightin up or pinch ( close up ) squeese

my girl clam up then I over lube . Sooo I keep telling my honey don't clam up this time, just wrap your toes around my ears and relax....

clam up by itichie_nocanpo August 27, 2006

Roughing up the clam 

Female masturbation

Roughing up the clam, Scrubbing the clam, roughing the diamond, playing with yourself, getting off, spending some private time

Roughing up the clam by edenmanon January 22, 2009