When you're so chill that even your chin is chilling. But also chilling as it gives people chills when they see how chilling your chin chilling is when you're chinchillin.
Yoooo you see that chinchillia?? Hes so chill! W..wait...look at his chin!! He's...he's.. HE'S CHINCHILLIN!!!!
Remember that chinchillia that you thought was chinchillin? Well turns out he was actually a villain with Walter White's face on 'im!
YOOOO HE WASN'T CHILLIN!!! HE WAS THE CHINVILLAIN ALL ALONG!!!