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When a dude holds his thumb over his dick hole while he spooges so that his jizz sprays in a fine mist. Then the mist refracts sunlight and you can see a rainbow in the jizz mist, or jist.

You can do da same shit wit a garden hose, except garden hoses ain't got jist.

"Yo man, last night I jisted on mah girl and saw the most ballin' cumbow in front of dat bitches face."
by Stevey B. November 19, 2008
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