jack the stack 

shortened version of jackin the smokestack, meaning to jerk off or masturbate.

only used by men of course.

james: wtf are you doing?
me: chillin at home, about to jack the stack.
james: haha, n1.

jack the stack by rayjay April 23, 2006

hit the sack jack 

A term used to tell a person to do something or leave a certain place. This term was first developed when a super scientist changed the channel, which his grandson was watching, on the television.

Son: Hey! I'm watching TV!
Grandfather: Hit The Sack Jack!

Son: I don't know if i should ask her out Rick.
Grandfather: Hit The Sack Jack!

hit the sack jack by Mattanian May 29, 2017