A notion, mostly used by very shallow girls, which suggests that there's this mysterious attraction between two people that's out of anyone's control, and either "just happens" or "just doesn't happen". It's complete bullshit, and more specifically just a cop out to use when a superficial girl tries to pretend she isn't shallow by telling some guy "there's just no chemistry between us", as an excuse not to be together. What she's really saying is "I'm an ignorant bimbo too hung-up on superficial qualities, and I don't care how nice you are because you're not "hot" enough for me. I need someone more attractive, even if he is a complete and total asshole". Then they go around saying things like "Oh, woe is me, I don't know why I keep ending up with the wrong guys". Gee, I wonder why. Will they ever get a clue? Maybe, but it usually doesn't happen until the girl finally grows up, which is usually around the time she turns 40 or so and realizes the qualities in a person that REALLY matter.
I believe that chemistry plays a huge part in a relationship and if that isn't there, then it's just not meant to be.
-- just another bimbo