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Negative - When a situation is over planned and fails before it starts.

- Leaving you partner unsatisfied and upset but who cares.

Positive - Uncontrollably amazing

- 3 Seconds of joy followed by an apology
“This beer so good it made me pre-Jac”
“I’m Pre-Jacing all over this beer.”
“I totally pre-jaced that presentation.”
“Pre-Jac Attack”
Pre-Jac by pre-jac June 16, 2017
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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

pre-jacking 

Jacking off prior to the actual desired ejaculation time - the goal being to cut down the time required when actually finishing the job.
He didn't think she was actually going to do the trick, so he started pre-jacking while she was in the bathroom.

Pre-Jack 

Clear substance which precludes sex. Often causing squigy-ness in one's shorts, leading to your hammer sticking to your gitch.
ex.1
Guy: You don't have to spit baby!, just use the pre-jack!

Girl: yeah!

ex.2
Girl: Shit, did you cum already!!?!?!

Guy: Naa, Girl, it's just a lil pre-jack... fap.
Pre-Jack by Bejnay March 10, 2009

pre-Jacksonite

a pop star that was popular before the rise of Michael Jackson in the music world.
Can you identify any pre-Jacksonite?

pre jack 

the slang term for premature ejaculation. also means to finish something rather quickly.
girl 1: i heard you had sex with your boyfriend for the first time last night.
girl 2: ya i did
girl 1: well? how was it?
girl 2:... he has pre jack
pre jack by dreadlockmamba January 13, 2011

Pre Jack 

To grab, buy, or do something before it is necessary to do it in order to prevent having to do it in the future — just in case it would be necessary to grab, buy, or do it later.
Imma pre jack that PS5 a month before Christmas, in case they sell out at that time.
Pre Jack by Prejack February 2, 2024