Excessive love for one's mother, often past the point of ordinary mother and son relation. Often used as a tease/insult for a person who's overly protective of mother, and is shortened as mom con or mom-con.
John: Yo that kid Kenny seriously kisses pictures of his mom every morning when he wakes up. I've even heard that he baby talks to her whenever they speak to each other.
Gideon: What the hell... sounds like a serious mama's boy.
John: No way at that point its just a severe mom complex.
by Falco3688 December 21, 2020
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1) Like "Oedipus Complex", except for less creepy and far sexier
2) Being severely sexually attracted to your girlfriend's or wife's mother, as described in the Fountains of Wayne hit "Stacy's Mom."
3) Willingness to leave your significant other for his/her mother.
Guy One- "Dude, the only woman I would leave my girlfriend for is her mom. Have you seen her?!?!?"

Guy Two- "Yeah man, your Stacy's Mom Complex is completely justified"
by Dash Fever January 28, 2010
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