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 knifebarber.
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!!
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.
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).