Used to describe a person who has an attitude that is sassy and snappy. Usually it is because the person remarks in an unexpected way; It is part of their personality.
person 1: "So how was your day today? You look kind of tired."
person 2: "Get away from me your annoying!"
person 1: "Okay...Geez I was just asking how you're doing... That's some serious sassafire man!"