unjoin
The same as "leave." Mainly used in video games when you join the wrong game and have to leave.
AdeptTJ: Join the game I sent you!
Chespin: Nobody's there...
AdeptTJ: Oh yeah, wrong link. Unjoin real quick. I'll send you the correct link.
Chespin: Nobody's there...
AdeptTJ: Oh yeah, wrong link. Unjoin real quick. I'll send you the correct link.