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15.
Native Americans would say this back when the pioneers where just settling in Arizona. Because of the pioneers bloodlust they used code to let other natives know where or not it was okay to travel on certain pioneer streets at night.
Depending on how the street was allowed for someone to say Streets Ahead, Streets Behind, or Streets just fine.

For the modern day usage, streets just classifies if something is cool or not. A clever way to judge someone without them realizing what you are talking about. Just like the Natives of old.
Olden Day:

"Little bear, this is streets is behind."
"Someone told me this street was just fine."

or

"This is streets ahead and we will be just fine traveling home buffalo hoof."
"Look out wolf heart! This street has surprised us!"
"What did that injun say?"
*death*

Modern Day:

"Man, my homework really sucks."
"Streets ahead little bear."

or

"This book I'm reading is streets behind."
"Let me see that."
"Well, what do you think?"
"This street is just fine, your the a-hole thats streets behind."
"Bastard."
*death*
by numpers October 28, 2010
 
1.
Of or pertaining to the urban "street" culture, undergound, based around the core of hip-hop, skateboarding, bmx etc.
You that dude was fly and dressed so street!
by Liam October 24, 2003
 
2.
rough, poor, gangster, ghetto
he was wearin headphones for a belt; motherfucker is street
by hpsauce February 01, 2005
 
3.
you cross it to go on the other side
i crossed the street and got on the other side
by hctz October 22, 2003
 
4.
hallways in prison.
"that guy across the street is doing the same time as me"
by x July 23, 2003
 
5.
Where the poor ghetto people live.
I be livin' on da sreetz G
by jacob December 27, 2004
 
6.
Knowing the street. Being able to pick up on all types of things quickly. Relating to all types of people, not necessarily just the lower class.
A street kid that has a degree is an awesome thing.
by Bill Samson May 22, 2008
 
7.
The opposite of bourgeois. 'Street' implies hustle. Every man a potential enemy, every woman a potential hoe. Money is king. The cold reality of day to day life and achieving. Someone who is 'street' is ready to defend themselves at all times and jump on any opportunity to level up. The paradox is that anyone who gets comfortable loses all street cred. There is not one hip hop star today who has street cred, because they have all gone soft.
You're not street, you're five star suite.
by soached August 10, 2010