When you're trying to hit on someone in a bar, but in order to make progress you need to cut loose his or her friend (because they are unattractive, annoying, etc.). This can be extremely difficult if the friend is a woman, as these friends typically don't like to be pushed aside, and will actively try to ruin the night for the potential couple.
"That girl was totally feeling me, but her fat friend was pissed off that there wasn't a wingman for her, so I had to pull a friendectomy."
Noun.
1. The process of selectively removing persons deemed offensive, disrespectful, or having questionable motives from one's social circle or collection of friends.
2. In social media, e.g. Facebook, MySpace, Google, Twitter, the process of deleting, removing or "unfriending" such persons from one's friends or contact list.
I'm about to perform a Facebook friendectomy because the things she keeps saying on my page are just plain stupid.
The act of cutting out the de-friending of a Facebook friend. In other words, adding someone back after they are removed from the friend list on someone's Facebook page.
Joe was de-friended?? no way! Bob needs to perform a Joe de-friendectomy, i.e. re-friend Joe now!
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.