A member of the Church of Jesus Christ of Latter Day Saints that actively follows and participates in their religion. This phrase traces its origin back to Las Vegas. Opposite of jack mormon
1: Is Katie coming to the party this weekend?
2: no dude, she's a molly mormon.
A female member of the Church of Jesus Christ of Latter-day Saints (Mormon) who fits the stereo type of the goody-goody Mormon. She's very devoted to the Church standards. Can be used both negatively and positively. See also "Peter Priesthood."
Sarah is a total Molly Mormon. She never misses Sacrament Meeting on Sunday!