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Open a can of whoop ass means you’re about to get the biggest beating of your life like a cockroach in a blender.
My mom saw my report card and OACOWA’d me so hard I got a black eye and a new nickname: 'Report Card Charlie.'
When the principal caught us eating pizza in the library, he OACOWA’d us like we were his long-lost enemies.
My dog tried to eat my homework and I OACOWA’d him with a ruler. He ran out of the room barking like a madman.