When you need to actually take a dump, and someone jacks your stall to pee or poo.
by kebinahhh July 16, 2010
1 more definition
Excusing oneself to the restroom during working hours for a quick tug of the man meats.
Oh man, three minutes until the staff meeting, that's totally enough time for a stall jack.
by asdflasdfasdffff January 20, 2011