If two girls or two guys are chilling and none is interested in the other, the resulting meeting is that of the "hanging out" and "shooting the breeze" variety. They may talk, play games, or watch movies...all platonic
If a guy wants to "chill" with a girl that he's interested in, whether romantically or sexually she should certainly run in the opposite direction if she wishes to remain single and unattached and is interested in the guy in any shape or form. If she wishes to actually date this guy, she should play extremely hard to get and postpone this "chilling" for as long as possible. Said "chilling" should not occur until the two are actually dating. Prior to this, they should actually go out on dates.
Hey Tiana, we should chill sometime. (red flag if this is from guy to girl)
"Dude, that's chill."
"I just killed my mom."
"I just aced my test!"
2) To think something is cool.
Bill: *checks out Franklin* "Hey man, I think you got a hot package"
Franklin: *stands in a form of anger, and prepares to shank Bill, then realizes that he is chill, and takes a seat* "Thanks man. ^-o"
2) "Hey Willis, did you know that your name is so Chill!"