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4.
When you're working out and you get a hard-on so you jack off. After you cum, you clean yourself off and go back to working out.
"Hey Bro, I was halfway through gettin' swoll when a total babe walked by me."

"So what did you do?"

"I whipped out my raging hard cock and jerked out by the treadmills."

"Dude that's really messed up, I could never jerk out in public."
by DickSchnepp January 22, 2013
 
1.
1. To masturbate in a strenuous way

2. A session of jerking off
I had such a good Jerk-Out yesterday, my girlfriend got naked on webcam & I produced a quart of semen.
by J-BAILS13 July 25, 2010
 
2.
Excessive or prolonged masturbation to the extent that it becomes a form of working out. Usually this results in sore forearms.
I got a serious jerkout after watching Anal Masters six times in a row last night.
by TayRexz April 03, 2011
 
3.
A jerkout comes in two varieties, pre and post jerkout. A pre jerkout refers to the act of masturbating before hitting the gym in order to get amped up. A post jerkout is when you choke the sheriff after the gym and is a vital part of the recovery process for your muscles.
Bro 1 - Hey I just bought this awesome pre workout from GNC you want to try it?
Bro 2- Nah man, I'm all set. I just had an awesome pre jerkout.
by ThatGuy915 December 17, 2013
 
5.
To get the hell out of Dodge before things go all queer. Pigs and such.
We were partying down by the river, things were getting crazy, so we had to jerk out before the pigs arrived.
by rudeboy43 September 26, 2014