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to move on, get over something. (particularly in reference to girls)

originally from the website chatroulette.com where F9 will skip you to the next person
- You're still thinking about her?

- Yeah..

- Dude, F9 that
F9 by D burner February 8, 2010
F9 - Verb

The action of F9, moving along or progressing with "zero fucks" given in a hastily manner.

Can be used directly to tell someone to hurry up and make a move or to emphasize that things are going / progressing.
"Let's get this going dude! F9!!!!!!!!!!!!!"

"What's taking so long, just F9 already."

"We're about to be F9'ing some minerals after we're done farming this."
F9 by Zelias May 22, 2019
"damn she f9ed that bitch"
f9 by GEEnasty March 29, 2010
if you dont like the way someone looks (another term for rejection)
f9 by josh mitchel May 1, 2010
To go through relationships rapidly, to be promiscuous.

Derives from Chatroulette, where the F9 key brings another chat-partner up.
Dude 1: "I was thinking of trying to start a long-term devoted relationship with Maria."

Dude 1: "Not gonna happen. She straight F9s dudes."
F9 by PostHaste February 23, 2010
That's just f9.

A: u ok?
B: yeh, f9
f9 by Rai-Thunder June 12, 2006