Top definition
The action in which guys shake the excess urine off of their penis after urinating.
I hope you did not forget to do your Jack Flapping

(this was Made by Jarryd Hardam)
by Somnili March 31, 2016
Get a Jack Flapping mug for your mother-in-law Riley.
Apr 28 Word of the Day
Literally everyone, ever. Including the writer of this definition.
by masokitsune January 17, 2019
Get the stupid people neck gaiter and mug.