Regional slang for members of the Church if Jesus Christ of Latter-Day Saints or "Mormons". Used regularly through the 80's by non-Mormon Utah residents.
Experiencing some what of a renascence in light of the recent political aspirations of one well known LDS member.
"Not happening dude, she's a momo."
"They are a bunch of momophobes. They will just stay home if that guy wins the nomination."
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