1. Arguably fun jiggles of the tongue that sticks out from the inner vagina in between your vagina lips.
2. When the privates in between your legs are jiggly with sensations of pleasure.
1. Friend: "Me and my friend just made out last night, watch our jilly jiggles!"
Friend 2: "I know right! That's mad insane, mad crazy, mine jiggly too!"
Friend: "Oh, people, they don't understand how I watched your girl last night shake it off too, last night with her jilly jiggles!"
Friend 2: "I know, her boyfriend's crazy, right? He got her to do it and take off her pants right in front of her, right in front of his eyes. It got him turned on and sexually aroused and they even went in bed and hit it off for the night."
Friend: "Well I'm pansexual, so anything goes for me!"
Friend 2: "That's right."
2. Man: *holding his penis and wiggling it inside of your girl's vagina, making her vagina lips bounce up and down in thrusts of the jiggly jiggles and his penis that shakes*
Friend: "You've got the jilly jiggles! Shake your willy! Party with your willy inside yo girl! The fun must never stop! Never ending! Take that vagina to downtown!"