Insta-karma is just a better sounding version of instant karma it is when someone does something either rude or something nice and then has something bad or something good happen to them almost instantaneously.
My sister called me a Jackass and on her way into the kitchen she slipped and fell on her ass, talk about Insta-karma
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.