The phenomenon in which two acquaintances/friends, both recently single after the dissolution of a long term relationship, become engaged in a purely sexual relationship. This must occur very shortly after the dissolution of said long term relationship.
This phenomenon is quintessentially mutual and void of strategic action and time ordering of events beyond the fact that both of your past relationships ended around the same time. Put bluntly, you both become single and then bam, one night you just start to hook up.
Person 1: It was really strange. Last night I thought I heard Adam leaving Jen's room.
Person 2: Ya that's kinda weird. They both just broke up with their ex's a couple weeks ago
Person 1: I think we're witnessing the MRS phenomenon
A guy who thinks he's gotten lucky since an attractive girl with a low self esteem decides to be with him. In reality, the girl is only dating him because she's trying get over another guy (A.K.A. she's "on the rebound"). The opposite/converse of this would be a rebound chick.
Cynical Friend 1: What the hell does she see in him? She's way out of his league.
Cynical Friend 2: Oh, it's nothing serious. She's just trying to get over her last breakup. To her, he's just a disposable rebound guy.
Penny: I'm still getting over this break-up with Kurt.
And this thing with Doug would just be rebound sex.
...
It's just -- It's my pattern: I break up, then I find some cute guy
and then it's just 36 meaningless hours of ... well, you know
Getting into a relationship with/hooking up with someone you generally dont care about much simply because you have recently broken up with someone and you are in the process of getting over them and want to have someone to fill the gap until your next meaningful relationship