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A matar is when someone is going to do something so hard they might as well be dead. Like if you eat 100 pizzas and then do 100 push-ups and then cry about it.
I’m gonna stay up all night and finish this video game or I’ll be a matar.
She’s gonna eat the whole cake and then run a marathon. That’s a matar.
He said he’d quit his job or he’d be a matar. He quit.