noun. A suit-clad professional (business-type) a.k.a, a "suit"; smacks a bit negatively but isn't necessarily so. Derived from the "har-har-har!" sound they make as they clap each other on their backs often in greeting or in mid-conversation.
I could barely hear what you were saying to me last night at the restaurant because the tableful of harhars next to us were so loud clapping each other on the back and har-haring away at each other's jokes.