1 definition by J Squared The Second

Just Fuck Off!

A way of communicating extreme stress and displeasure at someone coming in to something you do not want them to.

Luke: Hey guys!
Natalie: JFO Luke!
Luke: Well Damn
Jake politely asked Douche to leave but after hours of lingering around Jake lost his cool and shouted "JFO".
by J Squared The Second December 8, 2016
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