To be badly beaten by hoards of individually pathetic opponents. The expression is believed to be derived from an event that occurred to a cutter who was severely injured by a hoard of angry spider monkeys. However, it's also used commonly by soldiers referring to fellow trained fighters who're defeated by civilians...
Poor Captain Jack, he was an MMA fighter but he still got beat by the monkeys when he was drunk at a grocery store and started a fight with some bagboys.
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.