Literally the worst type of people on the internet. They have never read a single comic book let alone a book in their life, claim to know everything about Marvel characters but fail at easy trivia, and also shit on anything (even if they haven't seen it) that hasn't been dumped out by Disney.
Reasonable human: Spider-Man 3 though rough in execution does give great character moments and a satisfying conclusion.
MarvelLover3000: You like Peter dancing, ew.
Reasonable human: Doesn't Hulk dab, and doesn't Thor play Fortnite in Endgame?
MarvelLover300: Uh, you're just blinded by nostalgia!
Reasonable human: The MCU started 1 year after SM3, get outta my face MCU Stan.
by SoliquidForLife December 14, 2019
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Someone who only watches Marvel movies, doesn't read comics, and only hates on DC because Rotten Tomatoes told them too
John doesn't read comics, but just saw Infinity War and now won't stop talking about how bad DC is, he's just an MCU Noob
by xBomber45 April 29, 2019
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Similar in the way 'Weeb' is used to describe someone who likes PlayStation so much they wish to be Japanese. An MCU Weeb is someone who likes the MCU so much they wish they were one of Kevin Feige's pubes.

While MCU Weebs have existed since 2008 (the start of the MCU), MCU Weebisim had a sharp incline around the release of 'Avengers: Infinity War' in 2018 and continued with the subsequent film 'Avengers: Endgame' the following year.

However, the term 'MCU Weeb' was not popular until the release of Wandavision in 2021, as a way to identify those who will enjoy meaningless filler content, so long as it exists within the MCU.
They will tirelessly argue that the material is good, even when the person they are talking to has lost interest in the conversation.
"You are such an MCU Weeb"

"Only MCU Weebs like Wandavision"
by DrScottMcGluestick January 24, 2021
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like beer goggles, mcu goggles is when one’s obsession for the marvel cinematic universe is so hard it alters someone’s perception of how hot an actor from said franchise is
amanda thinks paul bettany is so hot after watching wandavision

“she just has mcu goggles”
by mpxm14 May 8, 2021
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A person with MCU syndrome is a person who thinks everything needs to be connected with each other, like a cinematic universe. They also think that every small detail or cameo has to lead to somewhere
"Omg you remember that kid in the gang at the beginning of The Batman? He must be Tim Drake"

"You must be suffering from MCU Syndrome"
by Lang boyy November 1, 2022
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