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The act of reiterating exactly the same thing your friend literally just said, causing a cloud of annoyance and awkwardness amongst the group.
Colin: "Guys, I just ordered 5000 condoms online."
Wyatt: "Oh, I was just about to say, I ordered 5000 condoms online too!"
-_-
Colin: "Wyatt, quit Jeffing me."
Dylan: "Yeah, you're such a Jeff!"
Jeffing by CamoCrocs69420 April 8, 2015
1. The act of secretly jerking off on video chat in the bathroom while your wife is in the other room.

2. Using childish insults like fat, ugly, and poor when you don't know how to use logic to defend your point of view.
1. Girl 1: Who is that guy?

Girl 2: Just some loser who is always jeffing me on snapchat.

2. You know you've already lost the argument when you start Jeffing.
Jeffing by Kasilyn13 October 23, 2018
the process of utilizing one's position of power to influence one of lower status into acts of an explicit nature
A professor was jeffing the freshmen this semester.
jeffing by Jeff's Victims September 4, 2009
the act of masturbating while using your own vomit as lubricant.
Dude, i jeff so much, i just got done jeffing and i need to jeff again.
jeffing by speedy_kingman March 6, 2011
section 8 slang- means "swingin on these nuts" or kissing ass.
you strait jeffin' my nigga- keep yo stupid tricks in tha traila.
jeffing by dave-o April 4, 2005
To ask someone out and not mean it.
Aidan was jeffing Emily by asking her out and broke up with her two seconds later
Jeffing by weeeeeeeeaver April 10, 2010