Chillin with your friends, or acquaintances, and chieffing at the same time. Basically sitting around the couch smoking a blunt. This word gets straight to the point that you wanna not only hang out but smoke too.
a: Wassup bro
b: nothin chillin at my house tryin to chillf
a: hell yeah lets chillf
-Last Saturday I didnt go out, stayed at home chillfing.