The slight swelling and sensitivity of the breasts which a woman experiences for a few days, just before having her menstruation.

The word "periodical" refers to both the cause of the increase in size and the short duration.
As opposed to "major boobage", the effect is minor and temporary.
Man: Wow! Your breasts have really gotten bigger! Did you get implants?
Woman: No, they are only periodical boobs. They'll be back to normal in a few days.
by akalisa April 22, 2010
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The enlarged version of a girl's tits while she is premenstrual and/or menstrual. Generally happens about a week to 4 days before starting her flow and may last throughout the week of her period, as well. Usually adds a half a cup size or even a full cup size to the female's nonmenstrual rack.
I thought I found a woman with bodacious tits, but it turned out they were only temporary period boobs. Bummer.
by Mercerbator October 17, 2010
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when your boobs are bigger while you're on your period because they're swollen
Did Ashley's boobs get bigger?

No she just has period boobs.
by missmawma May 26, 2022
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