What is Jillin?
1.
Female masturbation.
Every time I masturbate it's the kittens I am thinking of.
See
2.
Masturbation- female specific.
Evey time you go jackin' or jillin', God kills a kitten.
Think of the kittens.
3.
slang often used in the UK to express relaxation, Especially when on Drugs
"Dude is he dying?"
"No he's Jillin Like a Mofo!"
See