"Gustav momento" is a describtion used to describe the mentally ill. It can also be used to describe someone who's abnormally loud around others, particually in school.

It's a word associated with the stereotype of loud and obnoxious people.
Person 1: *SCREAMS.*
Person 2: "Jenny stop that, you're being annoying and very stewpid."
Person 3: "Yeah that's a real Gustav momento."
by Guesswhoisyourmother123 February 22, 2022
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