Rusty Jack Knife

A Rusty Jack Knife is a slang term for a geriatric man who porks women much younger than him. The "Rusty Jack Knife" comes in to play as a reference to his penis, which, aged, is rusty (hard to get erect), jacked (may have liver spots or warts), and knifed (smaller than the original youth size.)

"God damn! That old guy is a Rusty Jack Knife!"

by The Masticator May 2, 2005

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Jack knife

farting while holding ones leg creating a very loud fart.

Wow that jack knife was sOoOoOo loud!!1

by Adam D. April 24, 2006

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jack-knife

Having deposited your turd in the toilet, you look back to discover that its poking out of the water, too long and solid to go round the u-bend.

I had to go and fetch a stick so I could break up the jack-knife and flush the little devil.

by n_m April 1, 2004

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jack-knife

another term for a rude person, synonymous with asshole, jerk, dick, bastard

a way to curse without offending your grandparents

1) Dude, look at that jack-knife over there, what a douche!!
2) Quit being a jack-knife!!

by Jigga JMO September 16, 2008

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Jack Knife

A dive in which you jump into a pool , fold in your body with your hands & feet close to each other with the finger tips and toes pointing down, then unfolding bringing your feet to the air and keeping your hands where they are.

person 1 on diving board "HEY GUYS! CHECK OUT THIS JACK KNIFE IM GONNA DO IN THIS POOL!!"
person 2 from a far "YEAH DO IT!"

by Banzai Boy November 23, 2018

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Jacknifing

When a hammock is set up taller than it is wide.

Wow, that person is jacknifing in their hammock like no one's business.

I mean, I've seen people jacknifing at a 90 degree angle before, but that person is jacknifing at an impressive 20 degrees.

by katgumball May 23, 2016

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