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A promise made by guys who look like they just got out of a jail cell and forgot to shower. It means nothing. But it sounds cool. And it’s usually followed by a lie.
I guarantee it! You’ll never see me again. (He left the room. He never came back.)
I guarantee it! This pizza will be good. (It was a frozen pizza from 2008.)
I guarantee it! I’ll be there on time. (He showed up 3 hours late.)