shizzle means sure and nizzle means ***.
it's not that complicated if you listed to it as a whole
fo shizzle my nizzle = for sure my ***
and it's not just rappers that use bling bling and if you haven't heard that or know what it means then i have to wonder if you've been getting out of ur house a lot. although that word kinda died out.
but it's like jewlery really flashy kinda. like chains and stuff. "i got the bling bling"