Verb.
Femplaining is a portmanteau of the words "female" and "complain". A term used to describe when a woman complains about an issue(s) that are trivial and rant about them as if they are legitimate issues when in actuality, they aren't.
Female Barista: I just saw a white guy wearing a shirt with Japanese characters on it. That is so offensive! He shouldn't wear it if he's not Japanese!
Boss: Yeah, yeah. Quit your femplaining and get back to work.
In fanfiction, refers to a story where a woman gets pregnant by another woman. No man was involved in the context of the story.
This fictional situation is ever-so-slightly *more* possible than the equivalent Mpreg, as a woman can at least *get* pregnant (albeit not by another woman...yet). Oddly turns up in fiction less often than Mpreg however, mostly because as we all know, the vast majority of fanfiction is written by teenage girls and menopausal women.
If a fanfic is listed as fempreg, then expect a woman to get pregnant by another woman. Also expect little to no explanation as to how this is supposedly possible.
The tendency of some women to mistakenly believe that what they are complaining about is an important issue and who, consequently, proceed to complain about things that are of no consequence in the long run and are not interesting in the short run.
Man A: When she started femplaining to me what it was like to have an annoying friend, I stayed and listened to her.