What is a cray button?

Answer 1

The cray button is a metaphor, describing the threshold at which one's inhibitions are discarded. Cray is a recent slang for crazy, so pressing the cray button would be a description of the decision (whether spontaneous or ruminated upon) to begin acting crazy, as if were triggered merely by the press of a button.

Examples:

1. Wow, John really hit the cray button in his response to that critic.

2. I was impressed with the band's performance -- they really hit the cray button early into the set.

3. If that guy doesn't quit bullying me, I'm gonna hit the cray button.