(1) noun. in an operational sense, one whose flatulence actually closely mimics the olfactory properties of another's flatulence
(2) noun. in a social sense, one who takes on the characteristics of the clique, in which he/she seeks to belong
Bro 1: "Brah, did you fart or was that me?"
Bro 2: "There's no way to tell, you're a fart chameleon."
Bro 1: "Brah, I don't get it, in high school she was a goody-two-shoes, then she gets into college, ditches her old friends, and becomes a drunken slam pig. What gives?"
Bro 2: "It's simple brah, she's a fart chameleon."