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A word used to describe someone who lied and or lies
That's fake, stop being A Jack
A Jack by Mario's_Kingdom November 26, 2018
A brutal blow consisting of 5 knuckles generally to the jaw region named after "blck Jack Johnson," a black boxing champion from NYC.
Jamal served up a swift 5 jack to shawntiqua's jaw after she told him she was pregnant
5 jack by Doobtronix October 11, 2006

Jumping Jack Sack 

While having sex the guy does jumping jacks while still inside. Very hard to do a lot of training but well worth it.
Matt was so amazing when he Jumping Jack Sacked me last night

frocky jack 

Frocky Jack is a man who lived off of highway 601, and dressed in womens clothing, hence the name Frocky Jack. Frocks are types of clothing. The teens of the 60's and 70's would ride up to his house, and try to catch a glimpse of him in his womens clothing. In the late 1990's Frocky Jack passed away, inside his house. It is said that he may have killed 3 little girls, hanging them in the attic. However it is not known what all took place. The house is said to be haunted and is located off of HWY 601 in north carolina.
Frocky Jacks house is haunted.
frocky jack by legendofzink December 14, 2009

pencil dick jack 

its when you pretend to jerk off when your fist is close
pencil dick jack by bobo11232 June 26, 2009

Full Metal Jack Off 

The act of wearing army fatigues, camouflage face paint and a combat helmet while whacking off to porn at maximum volume to simulate the sensation of masturbating in the middle of a violent war zone.
I came home from church this morning and went Full Metal Jack Off on my horn.
Full Metal Jack Off by dickvandice October 26, 2013