visit from Flo
a visit from (Aunt) Flo
euphemism The time during which a woman menstruates; a woman's period. A pun on the female name "Flo" (a shortening of Florence) and the "flow" of blood from the uterus that occurs during menstruation. I always get horrible cramps whenever I get a visit from Aunt Flo. Do you think you might be pregnant? How long has it been since you've had a visit from Flo?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
visit from Flo(...ˈflo)
n. a menstrual period. (see also Aunt Flo.) I am expecting a visit from Flo, but she seems late.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.