A verb meaning to say "Goodbye" without actually leaving. Usually used in online conversations, when someone says "Good night" or "Goodbye", but still reads messages and replies to them.
A: Yo imma go to sleep. good night yall.
B: Good night.
...
some minutes later
...
C: As I've said, Jeremy, this madman, just fuckin jumped off the cliff into the sea and broke both of his legs when hitting the bottom.
A: Lmao thats siiiick.
B: Yo A is brexiting again....
A: Fuck you.
to brexit (v.); brexiting (n)