Definition of Aunt Flo
Aunt Flo 
noun
- menstrual period. Sometimes abbreviated AF. Also Aunt Flo and cousin Red.
Man, Aunt Flo is visiting.
AF came today.
I had unexpected company last night... Aunt Flo and cousin Red came to visit.
Submitted by Emily, UC Berkeley, Berkeley, CA, USA, Jan 13 1998.
origin
- This term may be a reference to unwelcome family members who arrive unexpectedly and without prior notice.
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