O clamp
An "O" clamp is when a woman’s legs become a pair of steel traps, squeezing the penis out like it’s a trespasser. It’s a quick move, but it can make you want to scream into a pillow.
Her legs clamped me out like I was a fly in a jar.
He was about to come when she clamped him like a vice and sent him back to the start.
I was so close when she clamped me out like I was a broken toaster.