Do you know where 'for shizzle my nizzle' really came from? Slanguage is all about the trends in UK street speech. These are shaped by American and Caribbean culture, even if we don't realise it. Roots Manuva and Crazy Titch talk about their attitudes to the words they use on the mic and why has US rapper Mistah FAB copyrighted some of his phrases. Listen at BBC 1xtra.