To ask someone out and not mean it.
Aidan was jeffing Emily by asking her out and broke up with her two seconds later
by weeeeeeeeaver April 3, 2010
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A very nice person, he can be a little stupid and is very quite. He only talks when he has to
Jef has broken the table

You sure jef isn't gay?
by Bv479 November 24, 2021
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A southern slang verb for shooting the shit. This involves joking around, teasing, or just talking to another person.
Mother: Why were you just sitting in front of the house in Jimmy's car for so long?
Son: Not much we were just jeffing.
by PotPie1121 August 7, 2020
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Jeffing is the act of interrupting peoples activities in a rude way.
*Jack and Nick are playing volleyball.

As Jack serves the ball to Nick, Jeff comes in and spikes the ball to the ground. He proceeds to walk away without saying a word. Jeffing
by Nickjp2 December 5, 2014
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When Jeff cums on someone rather than in them.
He was caught in the act of jeffing on her face
by dildoswaggins41 November 7, 2018
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Doing something that is out of the realm of normal human stupidity. See also retarded
"So I'm doing this Polish chick, right. All of a sudden I get this notion that slamming a vase over her head would be sweet. Ya know, like a donkey punch, except with a vase. Long story short, she filed a lawsuit against me for "assault" and "battery." I didn't hit her with a battery. It was a vase! Stupid court."
-"Dude, you were jeffing then, and you are jeffing now. Get away from me."
by Chief O'Chiefs March 12, 2009
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To squeeze puffs of air out of your enormous man boobs to mimic flatulence.
When I told my brother that it was my turn to play World of Warcraft, he started jeffing at me and told me to go away.
by Bebita March 27, 2008
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