this is a term coined from yaoi or bl community when a story is set in the omegaverse setting.
A Seme (typically an Alpha): You're an omega. Your kind just need to be breedable and submissive to alphas.
A Uke(typically an Omega): Alpha's are trash.
-submissive means being the opposite of dominant, hence being the bottom -breedable means that you are fufilling of the qualities that make you able to be filled with semen
“omg did you see michael’s storytoday?”
“yeah, they looked so submissive and breedable LMFAO”