I bet Chicken-chan is such a clueless memeloli that she uses phrases such as "laughing her ass off" in front of her friends, not realizing that she is directly talking about her own ass, bringing up the fact that she's got an ass, forcing everyone to stop ignoring the fact that she's human and has a smelly asshole she uses to poop.
The unintentional self-humiliation of Chicken-chan!