When a girls being ridiculously frigid about other girls having sex with boys.
"She said you're a slag cos you shagged a guy she once had a "thing" for."
"JESUS, she's such a clamp vag"
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When you are having sex with a dancer or strong women and she gets angry so she clamps your dick and you can not pull out.
Dude I was with this girl and I made her mad and she pulled a mean vag clamp
The act of squeezing ones vaginal muscles during intercourse.
Grace gave me such a vag clamp I couldn't get it out.