A sexual manoeuvre preformed by inserting four fingers in a lady's arsehole and the thumb in her vagina and preceding to "clamp" the rectovaginal septum in the hand.
Gaz tried fisting his bird the other night but he couldn't fit his thumb in so he popped it in her clunge and gave her the clamp.
I was clamping a slag once and I got so excited my thumb broke through into her arse.
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