phat chillin

When one chills very hard but looks chill doing it.

Bro, I was phat chillin at the party while everyone was getting lit.

Phat chillin'

Just enjoying life and chilling with your friends. Usually high.

Dude: so what're you gonna do this weekend my man
Other dude: probably gonna light up with the boys. We're gonna be phat chillin' you should come.