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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 22, 2005
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Jun 17 Word of the Day
Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.
Soundcloud Rapper: Check out this link, realist in the game!
Social media feminist: Women have a voice!!!! #Brave
Normal Human: SHUT UP CLOUT DEMONS!!!
by DebSlave June 03, 2018
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2
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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3
when you bend a dog in half and stick your knob in its mouth while someone else does it in the poopchute with a strap on. This way you and the other person can rub rusty sherrifs badges.
I jacknifed my collie last night. I think he might of liked it.
by dangerous dave April 13, 2005
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