A Horrock is a mythical creature existing only inside telephone lines between elderly gentlemen. First publicly referred to in the recent film "Alice in wonderland" (2010) by Tim Burton, this is said to have been a popular term for such mythical creatures throughout the 20th century within certain secret communities throughout the UK.
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.