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1.
to leap or climb upon an object, surface, or person in an overly dramatic cat-like manner
We were about to leave, but then Evan had to go and jellicle cat on the car. We had to wait for him to get off the hood before we could go.
by merwenna November 24, 2012
 
2.
An incredibly annoying gender-confused feline.

Used in a sentence:

Because Jellicles are and Jellicles do
Jellicles do and Jellicles would
Jellicles would and Jellicles can
Jellicles can and Jellicles do

as you can see, a jellicle cat is a terrible, terrible thing.
Interviewer: Is there a societal metaphor here?
Andrew Lloyd Webber: Dude, it's a play. About cats. Jellicle Cats
by CATSAREFOREATINGNOTPETTING December 08, 2010