Top Definition
The stain left in your draws or on a keyboard after a good Jackoff.
Man i hope mom dosen't notice that jack stain on wash day.

Nice Jack Stain man.

WOW!!! look at the size of that Jack Stain.
by JerkSquirt July 10, 2009
1 more definition
14 Words related to Jack Stain
A stupid person described by a spot or spots of ejaculation.
"Paulie was busted after trying to buy weed from an undercover cop...he is a real jackstain."
by Shawna123 August 08, 2005

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