Top Definition
some one with a nice booty
guy1: dammnn did ya see that girls ass?

guy2: dude yaa it was such a JILLI!
by lkcjfs October 12, 2008
1 more definition
That one friend who never talks, but who turns out to be the best one of all.
"You know he's such a Jillis."
"I know, he's an awesome dude"
by VictoireMcG December 27, 2014

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