a constant flake, or someone who flakes repeatedly
That fool is a jeff, he never pulls through when he says he will.

That fool is jeffin, he said he would be here hours ago!
by 1904LxVE April 27, 2011
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When a man pee's sitting down while straddling the toilet.
I caught my friend jeffin last night, how awkward...
by Matron Malice July 01, 2011
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Jeffins are one of the most kind boys you'll ever meet. They are sweet, caring, and actually care about you. Jeffin's are different from any other boy, they don't care about looks or body. They'd never ask for nudes. They are very protective of their friends. They are a little quiet and can keep to themselves but are overall just weird, awkward and the most fun. Jeffins make the best jokes. no cap. They will make you laugh until you're crying. They know the most random facts. They also always know the right words to say to calm you down. You can always confide in them and they will only confide in you if the really trust you. They might seem weird at first but give them a chance, they may surprise you.
Person 1: "Did you see that weird dude Jeffin today? Why was he rambling on about some random fact?"
Person 2: "Man, you don't even know him. He's actually pretty cool once you give him a chance."
by avgwhitegurl September 17, 2019
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Outdoor activity in Jefferson County Missouri, the greatest fucking county if them all. Often involves consumption of cheap beer (normally Busch Light). Most of these activities would be illegal anywhere else, but not in JeffCo, where you can do whatever the fuck you want.
Get the Beer Andy, lets go Jeffin' tonight!
by Bardbarian53 June 24, 2017
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The evolved word of "joking" with the slight different first name style change.
Larry: I bought a 2004 Dodge SRT-4 for just one hundred bucks off some old lady.

Hilary: No way!

Larry: I'm just jeffin'.
by Elizabeth L. January 25, 2005
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A name given to a child by his parents. Commonly used in India.
Hey Jeffin, how are you doing?
by Jeffin itself. October 24, 2018
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(v.) The act of giving oneself manual stimulation or pleasure via hand and penis. It is done by stroking oneself repeatedly; masturbation; jacking off.
Matt: Yo where have u been this last hour?
John: Just catching up on my reading.
Matt: Bullshit, you were probably jeffin it
John: You got me
by willemdafoe February 19, 2012
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