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Simply put it is the action of waking someone who is asleep in a moving vehicle. It could be a car, a train or even an aeroplane - it doesn’t matter! The deeper the sleep, the more effective the 'Jenksing'! See below for a more detailed dictionary definition.

jenks ( jënks)
v. jenks'd, jenks·ing, jenks'
v.tr.
To strike with sudden fear whilst asleep in a moving vehicle; alarm: to jenks someone.
v.intr.
To become frightened: a deep sleeping person normally jenks' easily.
n.
1. A condition or sensation of sudden fear on waking.
2. A general and instant state of alarm; a panic: that left him well and truly jenks'd!
adj.
Intention to frighten people: lets jenks him!
v. jenks·ing
The practice of waking someone in a moving vehicle.
v. jenks'd
The past form of jenks: you've been jenks'd!
A passenger in a car quietly asleep on the back seat is woken abruptly by the other passengers by screaming and slamming on the brakes to induce an abrupt wake up call to the unsuspecting victim. Hopefully the victim will give a hilarious reaction to this apparent impending crash which should be filmed and distributed to the world. This is the art of Jenksing somebody.
Jenksing by Garymugg September 9, 2012
Words you can keep

Jenking Off 

Jenking off is the act of taking a big whiff of jenkum before jacking off, using the left over sewage from the jenkum bottle as lubricant.
I heard Steve jenking off in the bathroom at school.
Jenking Off by School Wizard February 27, 2011
Related Words

Jenksin' 

v. The act of quiting

Its origin comes from the "butt-fucking quitter" Jenks.
"Man, why you jenksin' all the time?"
"Did you hear Jonny is jenksin' life."
"That butt-fucking quitter, he jenksin'."
Jenksin' by Jaharphan January 1, 2006
A sport often enjoyed in Australia and now, worldwide, whereby the perpetrator knocks on the front door of a random house after having turned off the main power switch in the fusebox or switchboard. The perpetrator then runs and hides before the householder comes to the front door.

This sport is best enjoyed close to midnight on a cold night for obvious reasons:
-It is cold outside and no householder wants to go outside in the cold
-You have the cover of darkness to hide in and a safe place from which to watch the madness unfold
-In the dark with the power off, electric lighting is ineffective, ensuring much hilarity
-Many adults will have already gone to bed by this time, ensuring a livid mental state when they get to the front door only to find nobody there
The boys and I went Jenking last night; I scraped my shin on the brick fence, but it was worth it to see Mr Jones go off his tree yelling obscenities out into the night.
Jenking by Pseudonym#2 July 13, 2010
v. Act of becoming the center of all that is awsome; excelling is the art of being the dopest shit.

n. Nickname for leader of a group because that person is so fucking rad in every way. A person who is the illest of all.
"Damn homie, she is so jenking right now! SSSNAP!"

GIRL #1: "Oh man, look how hawt that guy is!"
GIRL #2: "He is such the jenking of the posse!"
GIRL #3: "We should totally have a fourgy with him!"
jenking by NickSS October 3, 2005

Jenking Off 

What Chicago White Sox fans do when Bobby Jenks comes into the game in the 9th Inning to close it out
"Dude we're up 6 to 5 going into the top of the ninth. I can't believe how hard I'm Jenking Off right now".
Jenking Off by hedup34 May 1, 2009
when a guy&girl have sex in one of their parents room. THIS IS A MORTAL SIN.
person 1: "Dude I have something to tell you..."
person 2: "What?"
person 1: "me&Lonnie were jenking last night I'm goin' to hell."
jenking by lonlover6point9 October 26, 2011
More from Urban Dictionary

Salad Days 

green inexperienced youthful judgement and cold blooded execution of those judgements.

Rashness with little concern of consequence.

Antony and Cleopatra. William Shakespeare

"My salad days,
When I was green in judgment, cold in blood."

- William Shakespeare, Antony and Cleopatra, 1.5
"How did you end up in jail?"

"Salad days, 'nuf said."
Salad Days by GilbyRFC0 October 7, 2011
Word of the Day on August 28, 2026

age gate 

An absolutely foolproof way to keep minors from viewing content deemed "too mature" for them to watch.
Billy: "So I was trying to watch some videos for an M rated game, and I ran into an age gate, so I put in my real birthday. SOMEHOW it managed to figure out that I am 12. CURSE YOU AGE GATE!!!"

Bill: "Fucking age gate! *quick scroll* THERE! I was born on January 1, 1904. Fuck you age gate."
age gate by Banja January 7, 2011
Word of the Day on August 27, 2026

board chow 

A)
The Crud that collects under the keys in a keyboard. Usually more severe in the keyboards of programmers and webmasters as they tend to spend a lot of time at the the computer and thus eat at their desk. Mainly affecting IBM Model M (clicly) style boards.

B)
Can also be used to gross out Non-Techie people
A)
Bill: want to go to the club?
Bob: No, I've got to clean out my board chow, keys are starting to stick.

B)
Bill: Want to go out to get a bite?
Bob: No, i am just going to have some of my board chow/
Bill: Whats' that?
Bob: The food scraps that collect in my keyboard; Want some?
Bill: *GAG* *HURL* *GAG*
board chow by BinaryHackerMan September 3, 2007
Word of the Day on August 26, 2026

young pup 

a young person, a young adult in their late teens/early 20s.
Ah, you're just a young pup at 23!
young pup by the dog May 30, 2006
Word of the Day on August 25, 2026
West Midlands slang word for rockers, bikers, greasers etc. In the late 1980s it was used by the UK music press to refer to a specific scene centered around the bands Pop Will Eat Itself and Crazyhead. The term never found favour with readers of 'the inkies' (Sounds, Melody Maker and the still extant NME) and was soon dropped. Now often used in predominantly working-class areas of the midlands and the north to mean someone who listens to rock-derived music and/or dresses in a manner that suggests they affiliate themselves with rock music of some kind.
Some grebo passed with Sabbath playing on his stereo.
The Poppies are at no. 17? God, a grebo band in the charts!
They're playing nu-metal now, bloody grebos!
grebo by cactuscat September 15, 2006
Word of the Day on August 24, 2026

TikTok Farlands

TikTok Farlands is a term to refer to videos that you see after scrolling for a long time. These videos can potentially be disturbing, or weird. Said videos can also have low likes, or low comments.
“I reached the TikTok Farlands bro
Word of the Day on August 23, 2026
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