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2.
Slang term for the art of ejaculation/cumming.
Hey, did u ejac last night?

Ejac into the cup
by im me @ timladd04 on aim October 31, 2004
 
1.
noun. ejaculate, sperm

There is ejac on the bed.

Thank you for swallowing my ejac.
by Calvin Broadus November 19, 2006
 
3.
the nickname belonging to elana
"yo ejac, i like your jersey.. im going to have mine say 'ulation' on the back.. get it? get it?"
by ejac April 07, 2005