An Arash is someone who dresses nice, is very funny, usually friendly, but after getting to know this person they turn out to be a douche bag. In short, someone who is all talk and no follow through. Could also be known as a paper gangsta.
Lady 1: Hey how is everything going with Jake? Lady 2: Ugh, don't ask. He is always flirting and saying we'll get together soon, but then he never calls. He's turning out to be a total Arash!!