shizzle nizzle 

Any black person who likes rap music (especially gangsta rap) and/or is part of the black gang youth culture.
It's a pun that utilizes the fact that shizzle can mean "shit" as well as "sure". So while to some "shizzle nizzle" describes somebody who says "for shizzle my nizzle", it actually means "that fuckin idiot of a shit nigger".

Erwin is a fuckin shizzle nizzle.

shizzle nizzle by bumarse October 25, 2009

shizzle nizzle 

A variation of the the Shiznit, to mean something is the goddam best of the best, when shiznit just wont do.

ie:
Mik: I met this great girl, she is the shiznit, no wait, she is the ultimate shizzle with the nizzle!

shizzle nizzle by Lucy-doots October 16, 2003

shizzle nizzle 

fuck or shit

"ohh shizzle nizzle, i did it again!"

shizzle nizzle by Anonymous April 11, 2003

shizzle nizzle gizzingar 

A random jumble of words assumed to mean surprise or confusion.

Shizzle nizzle gizzingar! Damon Salvatore is about to take off his clothing!!!!

shizzle nizzle gizzingar by shaggsron November 6, 2011

for shizzle nizzle 

it means "i undubbildly concur my african american brother"

u high?
fo shizzle nizzle

for shizzle nizzle by Tyler February 16, 2005

for rizzlal, my izzle shizzle nizzle 

for rizzal, my izzle shizzle nizzle etc.

certain groups or gangs that can't speak english properly, so they have to make up they're own words in there place you they can say them w/ out screwin up.

for sure my awesome friend nigga
becomes
fo shizzle my izzle nizzle

for rizzlal, my izzle shizzle nizzle by incherz October 18, 2004

for rizzlal, my izzle shizzle nizzle 

izzly kind of thang that crawls in your rizzal nizzle shizzal my kizzal.

Yo, wuz up my homey g, for rizzal, my izzle shizzle nizzle!

for rizzlal, my izzle shizzle nizzle by Gabrielle Pumpernicle November 14, 2003