Top definition
He visits all girls at "that time of the month"
"Hey Jenny, why are you so pissed off?"
"Oh it's nothing, it's just that my uncle Flow is in town, and he really makes me angry"

"Hey Jenny why are you taking your purse to the bathroom"
"Oh. I gotta text my Uncle Flow, he just had to call in the middle of class"
by Uncle Flow October 18, 2009
Get the mug
Get a Uncle Flow mug for your brother Manley.