The act of smacking or otherwise hitting someone(specifically in the face) with a hairbrush.
Trevor was a little to confident as he stepped out of the bathroom following his mid-morning dump, so I knocked him down a peg with a swift weasel punch to the ear lobe.
by Editorial Salmon January 08, 2012
Where you walk up to somebody and punch them in the back of the head,knocking them out, then shit all over their face.
When Jon wasn't looking i walked up in back of him and weasel punched him.
by Miles, Sven, Paul, Scott July 09, 2006