Aunt Flo
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
A personification of the menstrual period or menstruation.
Register: slang
Where it’s used:
Used
American English
Examples
Aunt Flo came to visit last night: that's why I was so ratty.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “Aunt Flo” mean?
A personification of the menstrual period or menstruation.
Is “Aunt Flo” formal or informal?
Aunt Flo is generally slang.