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Said to be associated with the effects of baby-batter, prejack is the state of tongue lolling mental confusion found in horny men. In contrast to its antonym postjack, prejack tends to exist pretty much all the time, except for during the ejaculatory refractory period, (within which clarity is briefly possible.) Tends to affect purchase decisions, especially in the case of jewelry, is associated with awful decision making, and is heavily exacerbated by young, limber, blonde strippers.
Prejack that seemed like a pretty good idea... spending $840 on 45 minutes worth of lap dances. Now my pants are just sticky.
prejack by Beef Ranger October 22, 2008
The act of masturbation (but not to full orgasm) such that any further stimulation will result in an instant ejaculation. A cock in this state is now considered to be prejacked. Contrast this with a limp dick or a fresh boner where it needs a certain amount of stimulation prior to ejaculation
DALE: Hey Minday, wanna fuck?
MINDY: I would, but Katie told me you prematurely ejaculate
DALE: Ohhh no fuck babe, I just prejacked myself sometimes
prejack by _GHOST December 7, 2010

Ketchup PreJack 

That semi-gooey, clear liquid that comes out of an unshaken ketchup bottle before thr actual ketchup comes out
Damnit, I got ketchup PreJack all over my fries. I can't eat this shit! It looks like Ronald McDonald jerked on my plate now!
Ketchup PreJack by StrongDynamics September 30, 2020

Prerackquesite

The requirement that a woman have a huge set of titties before being considered for employment is a "prerackquesite".
Sarah applied to be a waitress where two of her friends worked, but she shouldn't have. Everyone knows the manager Jimbo has a prerackquesite. Every girl who
works there has a huge set of honkers and Sarah looks
like she just got her first training bra.
Prerackquesite by zuluwarrior September 10, 2010
when you pee and it jacks up your d
man i really peejacked this morning .”
peejack by st3ve. April 7, 2021

pre-jack 

To jack pre a sexual encounter as to prolong erection and performance.
Fap, fap, fap - I'm getting sex tonight.
pre-jack by Anonymous September 21, 2003