A verb in which someone is "Jay'ing" it up.
This means they constantly undermine your ideas, statements, actions, etc.
When someone is Jay'ing it up there is a possibility that the are being a total douche or sarcastically supporting your ideas. If someone is Jay'ing it up, call them out on it.
Guy 1: I think we should go to the swimming pool today.
Guy 2: Thats a gay idea bro
Guy 1: Stop Jay'ing it up!