guy 1: hey man what are you doing tonight guy 2: idk man i'll probably just be bustin' a fat chill at my place
to relax extensively, often times through the recreational use of large amount of marijuanna
"guy 1: hey man what are you doing tonight guy 2: idk man i'll probably just be bustin' a fat chill at my place" What is the definition of "bustin' a fat chill"?