It occurs during a one-night stand. You bang the bitch raw-dog, and as you bust, you pull out and blow your load on her chest/stomach. When she goes to the bathroom to clean it off, you grab your shit, leave and you steal some of her D.V.D's on the way out (Don't-Mind-If-I-DO).
Damn son, I totally oopst that bitch. Let's watch some of her D.V.D's.
This is the last step for a successful oopst It's stealing something before you leave the house (usually D.V.D's) from a stranger you just blew your load on, while she is in the bathroom cleaning it off the cum. Make sure you won't see this bitch again. And if you do, try to oopst her again.