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Missouri Jack Knife 

When a person uses their busted teeth to cut someone during oral sex
I was getting head the other day and that bitch gave me a Missouri Jack Knife!
Missouri Jack Knife by loafnaround September 2, 2020

jack knife barber

A person who performs illegal abortions. This term is used in the Jethro Tull song "Cross-Eyed Mary," which is about a very young prostitute.
"She dines in Hampstead village on expense accounted gruel,
And the jack knife barber drops her off at school."
Mary had an unexpected surprise, so she paid a visit to the jack knife barber.
jack knife barber by mito0 October 12, 2008

JACK KNIFE TEA PARTY 

Try this if your girl is really flexible!!This is done when you're standing up & having sex doggie style, your girl then procedes to bend further down & put your sack in her mouth for a tea bag!!
JACK KNIFE TEA PARTY IS DOGGY STYLE WITH A TWIST!!

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.
jack knife by afrojim2009 June 16, 2010

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.

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?