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Acting like a total idiot who has no clue what's going on. You're so clueless, you probably think the internet is a place you go to buy groceries.
My cousin tried to play Fortnite and got killed by a goat. Classic n00bish behavior.
He thought 'n00b' was a type of sandwich. That's n00bish.
She texted me 'What's a meme?' during a zombie apocalypse. That's n00bish.