An abbreviation to describe a premature ejaculator
Wow, what a disappointment last night was...he was a total prejac, so of course, I didn't get my kicks...
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Short for pre-ejaculation, but can be used to replace "bullshit"
"Man, that's a load of prejac!"
"You're Prejacking me!"
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The constant state of "pre-ejaculation" by those who are always consuming porn to get in the mood to masturbate (and may be dealing with a wet tip from precum).
She's hot. That's some good prejac content right there.