Wanting nothing to do with someone, whether as a friend/acquaintance or more. Can be abbreviated as "idfwy" or "idfwu". Gained popularity from Big Sean's song. Not to be confused with the sexual meaning of "fucking someone".
Kacey: Hey why don't we invite Lisa to the party?
Marissa: Hell no. I don't fuck with her, she's annoying
Jason: Hey baby I miss you, let's get back together
Kacey: No thanks, I don't fuck with 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.