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(Verb) A 'portmanteau' consisting of the words Jacket and Huffing.

The act of sniffing an individual's scent off an article of clothing that said individual discarded or left behind accidentally. Typically committed towards a person who is known to have a distinct or pleasant smell. Used in a negative connotation, as it is often done in secret - albeit harmless. The enthusiasm and force of the inhalation usually increases with the creepiness of the one practicing the behavior.

Not to be confused with the homosexual act.
Jacob left his zip-up sweater behind after the party. After noticing he had forgotten it I was innocently Juffing it, wondering if he wears some sort of cologne.
Juffing by Gohound October 10, 2012
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The act of posting mostly random gifs and/or images accompanied with out any captions or context.
Person A: "Why is this guy spamming random gifs?"
Person B: "He's just jiffing."
Hitting the whip and the nae nae with MAXIMUM proficiency.
Person 1: "Yo, did you see Jeff Jeffin' at the party last night?"

Person 2: "Holy shit yeah! it was awesome!"

Person 1: "He did it so productively."
Jeffin' by tybler June 26, 2023
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!
Jeffin' by Bardbarian53 June 25, 2017
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'.
jeffin' by Elizabeth L. January 25, 2005
To ejaculate onto a Mc Vitties Jaffa Cake, and then possibly give it to your sister so she can experience that salty pleasure
1. "Josh just Jaffed on that JaffaCake, he offered it to his sister." (He had cum all over the now soggy Jaffa)" 2."She loved the sight of him jaffing furiously last night"
Jaffing by Old Sweaty Man 69 May 10, 2016
A name given to a child by his parents. Commonly used in India.
Hey Jeffin, how are you doing?
Jeffin by Jeffin itself. October 24, 2018