When something is really extraordinary, it's a doozy. You took so many photos of your adorable new puppy — you're sure to end up with some doozies!
You can use this colloquial noun in a positive or negative way, whether you're admiring a doozy of a sunset or having another doozy of an argument with your twin sister. If it's a doozy, it's really unusual or even unprecedented, and well worth remarking on. Though doozy came first, around 1903, the luxury Duesenberg automobile was nicknamed "Duesy" in homage to the word.