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.