(only for guys) when you stick your hand down the back of your pants, then rub your ballsack. touch the victim or- slap- them in the mouth or face. Then yell "DOWN SOUTH IN YOUR MOUTH!!" no teacher will know what it means.
Colin: oh my god!
Matt:what?
Colin: That ass-hole just did a down south in your mouth to me.
Matt: oh. HA!
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.