Shortened form of a "Zzzz
Job" (pronounced "Zee
Job".)
Oral sex performed on a man while he's asleep.
Ideally: while he's experiencing morning
wood and resulting in his being roused from sleep.
See also: morning head.
Note: The "ZJ" version was made famous by the (excellent) show beerfest
Q: What are you so fucking happy about?
A: My
baby's momma gave me a ZJ this
morning! :-D
Q: Did she swallow?
A: Fuck yeah she swallowed; She knows not to leave a big white
stain on my sheets.