Jacknife

When you burst out laughing, so hard and so suddenly, you involuntarily fold in half at the waist. Usually accomponied by a large exhale of breath.

It was hilarious, and when he hit the punch line, I jacknifed.

by KeriBlog August 2, 2012

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!

by SabDek April 19, 2003

jack knife

When a trailer being hauled loses traction and begins sliding to the side of the vehicle that is hauling the trailer. Similar to a rear wheel drive vehicle fish tailing and losing control.

Passenger: Dude you better slow down on that turn, its pretty icy out there.

Truck Driver: You're right, I wouldn't want to jack knife and cause a wreck.

by afrojim2009 June 16, 2010

Jacknifing

When a man has an orgasm while his penis is semi-erect.

"Man, I was so sexed-up last night - I started jacknifing the second she put her lips on my cock".

by Wobberino September 28, 2005

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?!

by Freyjawired November 23, 2016

jack-knife

a semitrailer truck accident where the truck portion folds backwards so that it resembles a jack-knife

I realized I had to take a detour when I heard about the delay caused to a jack-knife on the freeway.

by The Return of Light Joker October 31, 2011

texas jack knife

Sexual position:
male lays on his left side, woman (or other male) on her back. they are at a 90 degree angle of each other. the female (other male) can either put both her/his legs on top of the male on his side or they can put their legs every other (his/hers/his/hers).

Honey, wanna do the texas jack knife?

by TiaEveAvrilZen July 5, 2008