Steming from the term "Crazy", when Referring to someone as "Cray Cray", signifies their craziness to a whole other level. The ultimate second power of crazy. This person can either be insane in the brain. Or simply, TOO DOWN. To the point where its not even cool anymore.
Boy: "Lets have a milk chugging contest"
Girl: "Ok No. Don't get cray cray."
Extravagantly, ostentatiously crazy and j having zero regard for your behavior's actions because quite simply you just don't give a fuck.
Jordan is cray cray as fuck! Did you see the blunts he rolls? Man, they like 5g each!!! Shit, Nate Dogg (RIP) would be fucking proud. Crazy thing about it, he even more cray cray because he doesn't stop at 1. I seen him smoke 3 during one movie!!!!! Holy shit. That motha fucka is cray cray.