IABB stands for "Infinity and Beyond, Baby!" This has been taken from the character Buzz Lightyear in Toy Story can be applied to emotional expressions. It can be used in conjunction with love mainly, but could be applied to other emotions like joy, happiness, hate, regret, etc.
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.