1. To piaffle pee-afful is to trip over nothing but gravity, or to walk into something. To be a complete clutzy mess.
2. If something gets piaffled, it is made into a complete disaster, or a huge mess.
1. Sara: I just tripped over nothing! How silly is that?
Karen: You just Piaffled, you clutz!
2. Carl: Dude, you just piaffled that presentation! I've never seen anything as bad.
Alex: Yeah, I made a huge disaster. that was the worst case of piaffle I've ever seen.