In 2008 people in general would say they keep it 100% meaning they were fully being real honest or truthful,when they weren't. Slate Stone, inspired by hip-hop declared to keep it 1000 to separate the real from the fake. Keep it one thousand. This term originated in West Texas on KSTQ Hot 104.3
"Nowadays everyone say they 100...but over here we keep it 1000.."
"..too many people falsifying, just keep it 1thou.."
"Stay 1000, and Loyalty & respect will come..