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1 definition by Jack mehoff12312

A day that youself,or your friends take off from work/school(which day off from school is more likely)and devote that day to jacking off.
Bob: "Hey did you see where chris was today?"
Peter: "You didnt hear, He is having a jack off day."
Bob: "Boy I need one of those soon."
by Jack mehoff12312 September 20, 2007