Jackknife

[Luis Fok]

A large, strong clasp knife for the pocket; a pocket
knife.

[Michiko]

From what I know, its when an 18-wheeler is carrying one of those loads, any loads, as long as its carry a load, and its going at quite a [highspeed], suddenly braking, causing the actual truck itself to brake whilst [the loads] 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 its load. The truck (|) is [going forward], whilst the load (_) is scraping its 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.

[Magaret]

1. n.-a [pocket knife]

2. n., v.-person or object that is bent unusually at a 90 degree angle resembling the [shapre] of an open pocket knife, as in the case of a [car accident] or physical movements used in disciplines such as diving, gymnastics, yoga, wrestling, etc.

[Michiko]

[sex move] in which woman on her side bottom [leg] straight top leg [bent up] to her chest

[Donald Trump]

A Jackknife is made by dropping a shot of [Jack Daniels] into a glass of [Corona], [depth charge] style.

Similar to a Jägerbomb.

[Raeanne Dimick]

A knife with a folding blade.

[Mark Zuckerberg]

The action of pulling your pants down while driving, squatting above the seat, reaching your hand underneath your bottom, defecating into your hand, and then using the feces to smear your [windshield]. Done [ritualistically] for [courting] purposes.