In general talking like a cartoon character would make you sound like an idiot, but, in particular, I heard “てめえ” used all of about twice in public in five years in Japan. Once was a guy telling his wife and friend in a restaurant (in a low voice) what he’d have liked to say to someone’s face, but didn’t. The other was an actual yakuza being a violent asshole. You really don’t want to go around talking like that.
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