An Onomatopoeia, defining the act of hitting someone (preferably in the head) with an object that is guaranteed to make a noise. Some of these items can include things like a Pringles can, Frying pan, Gong, Metal pipe, or a Dodgeball.
Person 1: Dude I'm about to clonk this guy in the head with a can of Pringles Person 2: Bro this is gonna be so hilarious (Clonk)
Person 3: OW.
“God, the damn computer clonked out on me. I should’ve gotten the newer one.”
“I had to work all day today. I’m so tired I might clonk out.”
“Yeah, my uncle clonked out last week. Poor guy just couldn’t outrun those wild zebras.”