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A real fact that’s so true it’s like a bet you can’t lose. Or a way to shut someone up when they’re being a dumbass.
'You said you’d eat a burrito for a bet. That’s a factual bet, and I’m not letting you back out.'
'He said he’d bet his phone on it. I said it was a factual bet, and I won.'
'She used a factual bet to prove he was lying. He cried.'