Jeffening 

When Jeff receives admin rights in a discord channel and begins to transform everyone account into 'Jeff'. This leads to the eventual termination of the channel by the original owner.

Hey guys, remember when Jeff took over the discord channel... That was a real jeffening.

Jeffening by Jeff's name isn't really Jeff. September 2, 2018

jefferine 

An noun representing a respected human being found in urban to suburban environments known for spending more hours studying at home than the hours spend in school, hanging out, and sleeping combined. Typically, a jefferine would be dissatisfied with a 99% because he or she believes that the amount of time put into studying should correspond to a 100%.

A: Why does John always rush home right after school?
B: Haven't you heard? He's a jefferine; according to my arithmetic, 7 hours of school and 5 hours of sleeping amount to 12 hours, so he has to spend the remaining 12 hours studying.

jefferine by mrexotic September 5, 2012

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

Effing and Jeffing

A variation on the term "Effing and Blinding", meaning to swear or curse profusely. Used in the North of England, notably by one Karl Pilkington in an episode of the Ricky Gervais Show.

Karl: I've just slagged off that octopus, but at no point was I effing and jeffing about it.

Effing and Jeffing by AnaWanaMia? May 24, 2006

Jeffing

A Columbia Missouri based term referring to the action of leading someone to think you are interested in them sexually or relationship wise for the sake of attention or popularity. Can also be reffered to as flirting without wanting an outcome.

Kate has really been jeffing with alot of guys recently, shame they won't get anything out of it.

Jeffing by Cannonbolt June 28, 2019

Jeffing

The act of taking an egg, with draw on face with square glasses on a night out. Often involving taking photos of said egg in unusual scenes.

I went Jeffing last night! He got smashed!

Jeffing by Kyle454 December 24, 2012

Jeffing It 

To kill a vibe with a dead joke or just your presence.

*Matthew Barnes speaks

“You’re jeffing it 😔”

Jeffing It by Ops on fazal 69 September 26, 2019