Commonly used in the 80's but is experiencing a resurgence particularly from the hipster fixed gear bike scene.
2. "Dude, did you see that guy getting totally rad on his fixie, that 180 bunny hop was off the hook".
Can also be used in the event of tripping, spilling, fumbling, etc.
You: "On Friday, really?"
Me: "Oops, R.A.D. that, it's on Saturday!"