purple jelly is cough syrup with codine. usually mixed with hennessy cognac. the combination produces the "hyphy" effect.
term originated in the bay area ("yay area") of northern california.
"You know me I get that purple jelly in my cup"

Mike Jones on the E-40 CD "My Ghetto Report Card"
by brittbritt April 20, 2006
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a pefect amount of liquid hydocodine mixed in with a perfect amount of sprite. A Houstin original.
AKA purple sprite
I got purple jelly in my cup
by SAMMY May 14, 2006
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