One of two meanings:
1. To smoke a fatty and just chill
2. Just to kick it and hang low, with or without weed
Dude school sucked sooooo much ass today, I'm just gonna go home an chill fat all day

Brah: "whaddup dude, u busy this weekend?"
Dude: "nah brah I can kick it what u want to do?"
Brah: "u know just party and be chillin fat"
Dude: "fo sho"
by sixpackofnattyandichill January 4, 2011
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Really intense chillin' that usually invovles food
Person 1: What are you doing this weekend?

Person 2: Just chillin' fat
by Thetorax April 16, 2015
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