It's a jointing of the word demom and mom, and it's when you have a mom, who is so bad, that she's a demom sent to torment you from hell.
Girl 1: Ugh, my mom is literally the worst! She's always on my case!
Girl 2: So she's a literal demom?
Girl 1: Uh-huh.
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Moms who are like demons and are very aggressive, basically Karens and demons mixed together.
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The act of extreme demoralization. i.e: Being so demoralized, you feel as though you lost your mother.
Note: Used best in sports and other gaming related activities.
In Football, A score of 21-0 in the first quarter would be considered a demomalization.
In Mortal Kombat (any version), Two consecutive flawless victories is a demomalization.
Example phrase: "I've been thoroughly demomalized..."