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.