A person who tries to blend in with a certain crowd, usually preps, just to get the satisfaction of being cool. Of course, they are just fooling themselves that they have a life and are at all interesting.
"Dorothy is SUCH a chameleon now...it makes me sick."
The act of hiccuping while talking, resulting in an embarrasing attempt to hold it inside your chest, though that never works and you are left with a strange 'Hu-URP' noise.
"Jane, I like your-Hurp!"