To take a shit and Jack off at the same time. (its called shingering for the ladies)
I was taking the browns to the superbowl the other day and decided to make it better by shacking off.
by slyvester August 11, 2006
Get the shacking off mug.
the stall in a dorm or shared bathroom that you or someone else always beats their meet in.
"Has anyone seen Dan?"
"He's in the bathroom and I saw him go into the jack off shack so it'll be a while"
by lillukey August 17, 2018
Get the Jack off shack mug.