Mansplaining

It's a term which is somewhat vague but perhaps can be boiled down to; a man explaining something to a woman, something she already knows.

Anytime anyone explains something and they weren't directly asked to explain that thing, there is a possibility of explaining something they already know.  The ability to take cues and explain where it seems to be needed and wanted, is a skill and people have this skill to wildly different levels.  There's two kinds of errors which are possible:  Not explaining something that you should have explained and explaining something unnecessarily. 

Something I've noticed, is that women who complain a lot about mansplaining, also have a pet peeve of having a man say, "I know" when they are trying to explain something to him.  They are good at noticing when men fail to read their mind, but refuse to believe that they could fail at mindreading themselves: They'd rather believe that the man is lying about knowing something he doesn't really know.