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A face boner is when you can't stop grinnin like a傻瓜 because you're so happy or excited. It's like your face is doin a dance and you can't shut it up.
My face boner hit when my crush texted me, 'Hey, wanna hang out?'
I had a face boner when I won the prize in the raffle.
My dog gave me a face boner when he ate my homework.