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A hahauju is a person who thinks they're a pro but can't even beat a kid with a broken controller.
My cousin tried to play Fortnite and got destroyed by a 10-year-old using a toaster as a mouse.
I saw a hahauju try to beat a level and spent 20 minutes just to get past a tiny wall.
He called himself a streamer, but his followers left in droves after he got killed by a zombie in Minecraft.