Definition 1: a man who only wants to hook up with girls on their period. aka with aunt "flow in town"
Usage Example: A woman at the store shopping for tampons notices a man lurking in the "feminine hygine" section. If he tries to pick her up he's a "flow rider"
flow rider
Definition 1: a man who only wants to hook up with girls on their period. aka with aunt "flow in town" 
Usage Example: A woman at the store shopping for tampons notices a man lurking in the "feminine hygine" section. If he tries to pick her up he's a "flow rider"
