Sloppy seconds is screwing, shagging, fucking, whatever you like to call it, a woman, straight after the previous guy, or guys, using their cum as the lubricant!
The best I ever had was with a street girl at the end of her evening's work. She rode bareback and told me I was her ninth john that night. Man, her cunt was pure heaven!
Be the last, and ride those sloppy seconds!