The normal price for a brick of cocaine, usually at that price it would be fishscale;cocaine in it's purest form. term is used mostly by the rapper young jeezy "Jay Jenkins" and is reffered to a lot by other rappers when talking about coacaine
"seventeen five if you want a key"- Young Jeezy
"seventeen five bout to holla at jeezy"- fat joe
"Throw ya hands up high its ya boy Mr. seventeen five"- Young Jeezy
* In the last example he refers to himself as "Mr. seventeen five", but it still just represents what he is selling (cocaine).