A man who regularly promises things to a woman that he is involved with, (i.e. commitment, a future together, etc.), when he has absolutely no intention of making good on these promises. Very cold, calculating, and manipulative character, but with a very soft, kind, likeable exterior.
If you have dated/broken up with a man a dozen or more times, chances are you are involved with a mindfucker and should get out while you still have some of your dignity. And self-respect. And sanity.
When a couple sit there not talking at all, they could be reading a book or doing work, and one of them starts smiling because their minds, telepathically, are having sexual intercourse hence the term mind fucking. Mind fuckers usually sit in the same place everyday not talking only mind fucking each other.
Michael-Hey Nate, why are those two always so quiet?