ga mow mow - Smacking someone so hard on the head they might need a new b

Smacking someone so hard on the head they might need a new brain and a new dad.

My cousin got ga mow mow'd by my uncle after he stole his last slice of pizza.

I saw my teacher get ga mow mow'd by a kid who didn't like math.

My dog got ga mow mow'd by my brother because he ate the homework.