"For some people, 'innit' is just another tag question, a contraction of 'isn't it'. But kids in urban Britain are using 'innit' to cover a wider and wider range of situations. Here are some examples of non-standard use, gleaned from recent messageboard postings:
'Now I can start calling you that, INNIT!' (can't I?)
'I can see where my REAL friends are, elsewhere innit!!' (aren't they?)
'I'll show young Miss Hanna round to all the shops, innit.' (won't I?)"
If the BBC says the above is proper grammer, that's enough reason to early adopt, innit?
(link via kottke)