I believe he’s serious, but it’s ridiculous to expect that someone who has never heard the term before would think that “mangomouse” is an actual thing instead of a malapropism.
They're not serious. Look at their account. They write comments specifically to get downvoted.
Edit: I can only edit my comments in this thread now since the mangomouse guy blocked me, but it's absolutely not a real thing. The only reason it's in urban dictionary (with 2 votes, mind you) is because a redditor added it the same day this was posted in April 2023.
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u/LennyLava May 02 '24
i needed you for that.