Amalgamation of the words "is" and "it", used either to(worryingly)signify an exclamation or to a question in itself.
Highly meaningless expression favoured by both chavs and certain asian/black cultures often found within a similarly indecipherable banter.
Shreena - "Oh ma gosh! He was like, all ova her and like, she was like, geet off me! Like.."
Rita - "Awwww, issit?"
Shreena - "Yea, and I'm like, daz sum ova sheet..."
Originates from a mythical creature that lurks in the dark depths of Mawsley. People say the beasts head is so thin that it once collapsed into itself. It can turn sideways and seem invisible as the body of it is so thin. Watch out for this bony creture as it may use its powers to touch you, especially if your a man, while he is invisible