Opp is a more "hood" way of saying Adversary. It has originated from Chicago and is used by gangs as a slang term but is also now a part of Gen-Z slang for the same meaning.
Tyler: Aye that's my Opp right there!
Someone who you don't like or deal with. Basically your enemy. Plural "Opps"
I heard that she was hanging with your opps.
Pretty vis girl that is the coolest person ever!!!!!
She’s so opp.
Rae- rae is a nigga who dont know how STFU. He got a big ass mouth and is annoying asl.
"You see the nigga over there? Yea thats a opp frfr"
"SHOOT THAT NIGGA"
Someone you are madly in love with but you pretend to me enemies
I wanted to hate Kate, but she was an opp nevertheless and I would not soon forget her.