My girlfriend and I started using the term in 1998-1999. It started with her calling me cray Jay, which is short for crazy Jason and I told her, no just cray cray. Meaning crazy crazy.
When shit’s super craylike three times over, one more than cray cray
Boy: you’re abnormal, you’re weird, you’re stupid, I love you, you won’t shut up
Girl: yeah, this is all making me absolutely cray cubed
Boy: Ok, let’s have sex