hellovathing

produced from: hell of a thing
means amusement, admiration, surprise caused by an unusual sophisticated excellently-planned act or sequence of acts (which actually makes it more awesome)

- This is a hellovathing you pulled of, kid! I'm in awe!

P.S. the line above was taken from The СЦW show — Gossip Girl. It was said by Chuck's uncle Jack (JXB — Jack Xavier Bass) to Dan Humphrey after Dan revealed Gossip Girl's true identity.