A non-threatening threat. Basically, it's how one will show their anger to another, quickly look around for a sharp object, fail in finding one, and say the threat anyways, not being able to back it up. Usually used in a friendly manner, where the speaker (probably) won't stab the other guy, anyway.
Jack: Hey man, you know what a pelican looks like!?
John: Well, you've got the saggy chins, the beady eyes, and you are annoying as Hell, so... I'm gonna have to say, like you.
Jack: I will stab you...
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.