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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
Jeffing by Nickjp2 December 4, 2014
When Jeff cums on someone rather than in them.
He was caught in the act of jeffing on her face
Jeffing by dildoswaggins41 November 7, 2018
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."
Jeffing by Chief O'Chiefs March 11, 2009
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.
jeffing by Bebita March 27, 2008
To describe what someone did or said as stupid
Tom is totally jeffing.
Adolf completely jeffed.
Jeffing by icon626 November 17, 2009
Braiding nut hair.
I love jeffing you.
Jeffing by ItzxJ3ff April 13, 2016