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..."