Fanny Slap

A fanny slap is a slap that sounds like when you slap a fanny, it usually associates with a ruler and slapping it on the table anything that makes that tingling sound is known as a fanny slap. Could even be a spatular.

Person 1 & 2 are in the maths room

*Person 1 slaps his ruler across the table*

Person 2: Did you hear that?

Person 1: Yer it sounded like a fanny slap!