Ferlerberger is a word that is used to someone that was once something then forgot what it is to be like that. For example: If an old man yelled at a boy for something that boys do the man would prove he was a ferlerberger by forgeting that that is what boys do. for he was once a boy.
On page 826 of Harry Potter and the Order of the Phoenix Dumbledore proves to be a ferlerberger by forgeting how Harry might feel by being avoided and ignored.
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.