jvckk 

jvckk is a twitch streamer that is funny sometimes with a great buddy ninya that gets VERY mistreated. you can find jack in other peoples streams saying nonsense and his own streams also saying nonsense. he also has some FIRE merch that is very soft ( u should get it it’s really soft). jack is also a killer to the best emotes in history: jvckkChamp2 and jvckkAnyways

“happy birthday........jack” (aka jvckk) -ninja

jvckk by Evy Caroline December 1, 2018

jackknife

From what I know, it's when an 18-wheeler is carrying one of those loads, any loads, as long as it's carry a load, and it's going at quite a highspeed, suddenly braking, causing the actual truck itself to brake whilst the load's momentum behind the truck forces itself in motion against the truck, causing the load on the back to be intersecting at a perpendicular angle with the truck. Look at this---> |_ The | is the actual truck and the _ is it's load. The truck (|) is going forward, whilst the load (_) is scraping it's tires horizontally.

A jackknife is also responsible for causing many highway accidents, because when a truck jackknifes, it takes up all the lanes on the highways, and leaves no mercy for the vehicles in its path! Always speed up if you see a jackknife coming toward you if you cannot rapidly get off the highway.

*people driving*
Oh crap dude, that truck is in the process of a jackknife, that piece of shit volkswagon is in our way, guess the only choice we have is to speed up, step on it.
*person in volkswagon*
*ahhhh this is the life, *fart*, beer and hot sauce...boomheadshot.*

jackknife by Cobain will have justice. November 28, 2005

jackknifed 

v. tr.

1. Referring to automobile accidents, when a car is totalled to the point of folding in on itself, much like a jacknife.

Holy shit, Zach's new car got jackknifed by a pickup truck! What a tard!

jackknifed by SabDek April 19, 2003

jackknocker

An individual whos name when said outloud your first instinct is to shake your head in exasperation and sigh.

Statement: That guy is a jackknocker.
Question : What is a jackknocker?
Answer : *sigh*

jackknocker by Rawraw420 October 11, 2007

Toledo Jackknife 

When a male attmepts to fellate himself however the extreme angles involved cause him to throw his back out, and he is stuck in that position until help can arrive.

Hey, Steve got caught in a Toledo Jackknife, again.

Toledo Jackknife by Benevir August 23, 2007

jackknob 

The act of a male ejaculating on another males face.

Timmy and Pumba jackknobed on each other.

jackknob by Ricky P. January 29, 2008

Jackknifed 

When her pussy is so tight, he jackknifed his dick when attempting to penetrate. His dick bends instead of entering.

Girl, you're so wet, yet so tight I jackknifed!

Or

Have you ever seen a dick jackknife?!

Jackknifed by Freyjawired November 23, 2016