P.U.O.
When someone says it to you, they’re trying to mess with your head. Like they’re telling you to pay attention or get ready for something bad.
My mom said, 'P. U. O.! I’m coming for you!' and then she yelled at me for eating my lunch too fast.
My friend said, 'P. U. O.! You’re gonna regret this!' before he pulled my hair.
The guy on the bus said, 'P. U. O.!' and then he threw a banana at me.