Top definition
Noun used to describe when you and your friend(s) are on your period and thinking the exact same thing, sometimes several times in succession.

It can also be used when not on one's menstruation, but that was not what the phrase was originally meant for.
Julia: OMG, Nancy, you know what we should do?

Nancy: Steal Bob's chocolate bar?!

Julia: Yes! We're, like, totally on the same vagina wavelength.
by BriFee June 17, 2009
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