Top Definition
When you see a chick you know and it looks like her boobs grew a cup size. Then you see her again a week later and her boobs look like they've shrunk back. She was on her period and her boobs got bigger; she had period tits.
Hey did you see Jill yesterday? I swear her tits got bigger. She get a boob job?

Nah man, they're just period tits.
by Pufferfush January 30, 2014

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