After Jack 

The smell of a mans dick/hand after they are done masturbating with spit

"You need to wash your hands man they reek of After Jack"

After Jack by T0RP3NI$ March 27, 2019

afterjack

A small amount of semen released a short time after one masturbates.

One masturbates and goes about his business. Then a few minutes (roughly 5-15) later a small drop of batch drips out of the relaxing penis. A nuisance because it dampens the boxers/briefs.

John: "Ahh F!"
Pete: "What?"
John: "I just got some afterjack in my drawers."
Pete: "Hate it when that happens."

afterjack by Brainstorm April 5, 2009