When someone is in the act of going far beyond and out of the way to do something that puts the original agreed plan in complete limbo or risk of cancellation.
We were scheduled to be in Philly at 10PM with friends to party, but at 9:57PM, Pete pulls some "extra shit" and decides we need to go to Gettysburg to pick up a bitch and then go to Atlantic City instead.
A step beyond crazy but not as far as circus freak crazy. Like when someone has passed the point of being funny, but your not quite scared of them yet. Yet another invention of the infamous TZ.