As said by Snoop himself -
Fo shizzle: This has many different meanings. It means for real, for sure. I'll use it in a sentence to let you better understand, check this out: " 'Doggy Fizzle Televizzle' is gonna be off the hizzle, fo' shizzle."
While originating out of hip-hop culture, this phrase has been overused to the point of triteness. Its most famous usage is
Rich black man in response: "I concur with you whole heartedly my fellow African brother."
Ghetto black man: "..."