Used first in Bridget Jones' Diary, it has now become a synonym for the mindgames men play when dating. It can also be applied to women in rare cases.
It can be preceded by "emotional" to make it about manipulating emotions or just plain "fuckwittage"
Girl 1: Oh Dan said he loved me but he's not ready for a relationship
Girl 2: That's just emotional fuckwittage. Get out of the relationship!