Circus Jiffy 

When a girl gives a blowjob while doing a handstand.

My girlfriend gave me a insane Circus Jiffy last night.

Circus Jiffy by B@B February 16, 2014

juffish 

Acting puffish but with a "J" attitude

My Herm's rocking his juffish but he aint nothing but a puffish man

juffish by KrizziKat August 14, 2019

Jeffing

A Kansas City term for "faking" or being fake in general.

" Yo George stop jeffing with Ben, you was just talking bad about this dude a few days ago."

Jeffing by Gmoney289 January 15, 2018

Diffy in the jiffy 

Used commonly as slang in the modern videogame League of Legends, popularized by a Twitch streamer Tarzaned and many others, when one of the players in one of 4 lanes (Botlane, Midlane, Toplane, and Jungle) hardly underperforms in the Jungle role or gets outplayed by the enemy player several times, causing the game to be lost before 20-minute margin.

Yassou: Oh no! We have Nightblue3 on our team
Sanchovies: Diffy in the Jiffy it is...

Diffy in the jiffy by Chrive May 29, 2020

Reverse Jiffy Lube 

A hybrid of the popular reach around penis grab. This occurs when a female reaches between a males legs from behind and begins to grip and rub the penis. Done over clothes and results in a penis erection. Usually done as a mating ritual to see if the male "sizes up" so to speak.

Jenny is giving Earl a reverse Jiffy Lube. That lucky S.O.B.

Reverse Jiffy Lube by DIRECTOR DRE December 9, 2008

Joffin 

Joffin is very cool he is good at ear raping people and very funny. He has a penis larger than most other boys so you should date him he is single and ready
To mingle he will love you and he respects woman. Overall Joffin is pretty radical!

Hey Joffin how’d you cock get so big?!

Joffin by moisty dong October 20, 2019

Jeffit 

The act of doing something regardless of consequences. Born in the world of software code peer reviews, but can be used effectively across all aspects of life

Developer #1: Are you gonna add any unit tests to your code?
Developer #2: Nah man, I'm just gonna Jeffit and hope for the best.

Jeffit by GrumpyOldProgrammer November 13, 2018