sphincter punch 

The liquid that leaks from your ass when you’ve had the runs.

My undies were stained with sphincter punch.

sphincter punch by THE CareBear September 8, 2019

sphincter pinch 

sphincter pinch where you shove one finger in the vagina and one in the bum and try and touch the fingers together

that sphincter pinch felt good

sphincter pinch by kierzistheman December 20, 2008