one who chills and 'takes it easy'; listens to chill, acoustic music and/or just kick-ass beats. Usually a lover of Bob Marley, The Beatles, or Bob Dylan. Often seen 'chillin' all the time.
A normal teen talking to a chiller might say:
NT-"Are you gonna go water skiing this summer, or play basketball?"
Chiller- "nah, i'll probably just hit the beach maybe and chill all summer, no worries man"