Somebody who is Mormon but does things that's looked down upon and is against what Mormon's should be doing. Aka against their rules. For example; does drugs or drinks liquor.
P.1: "Isn't that Bob over there snorting a line and drinking?"
P.2: "Yeah,"
P.1: "Isn't he Mormon?"
P.2: "Yeah, but Bob's Jack Mormon so he does that kind of stuff"
P.2: "Yeah,"
P.1: "Isn't he Mormon?"
P.2: "Yeah, but Bob's Jack Mormon so he does that kind of stuff"
by Naadnad14 December 5, 2022
Get the Jack Mormonmug. by Skibabyy18 July 13, 2015
Get the Jack Mormonmug. Any class of hypocritical, self-righteous bastards that are members of the Church of Jesus Christ of Latter Day Saints and are prim and proper on Sunday morning and in front of other Mormons, but swear like sailors at work, secretly drink like a fish, cruise the net for kiddie porn on their work computers and are man-whores all over town.
"Always take at least two Mormons fishing with you or the damned Jack Mormon will drink all your beer"
by Demented Fish August 12, 2007
Get the Jack Mormonmug.