No chill can mean different things if you use the term differently, you can say
Lisa for example has "No Chill" meaning she's not being normal or is acting different/crazy. You can also say "No Chill" meaning no chill like no, chill.
Example 1:
*wakes mia up at 3am bc toothpaste lid isn't closed*
Example 2: "hey can I hang out with *insert male name* ?" "No he's gonna rape you even tho I don't know him at all or what kind of person he is" "mom you have no chill." "You're grounded"