Mansplaining has earned a safe spot in the category of unacceptable behavior, but some are apparently still in need of a refresher course.

A PhD student asked women to share their worst mansplaining stories on Twitter Wednesday. More than 150 responses have been posted, with people recounting how men once told them how to speak their own languages or attempted to explain concepts such as childbirth or breastfeeding - even though their conversation partners were clearly more qualified.

Men can become guilty of mansplaining when trying to explain something to a woman, typically unnecessarily and condescendingly.

Really? Women have been sharing their worst mansplaining stories on Twitter since Wednesday, with some recounting how men tried to lecture them on childbirth (stock image)

Knowledge: Some men attempted to give women unsolicited lectures on pregnancy and its effects, forgetting their conversation partners probably knew a thing or two about the topic

Several women revealed men had attempted to reveal to them the intricacies of pregnancy, oblivious to the fact that someone with a female body probably already knew a thing or two on the matter.

Recounting one of the most infuriating things she's ever been told, one of the women wrote: 'That I couldn't POSSIBLY be showing my twin pregnancy that early, so I must just be fat. After I delivered, I lost 16 lbs.'

Some men appear to be repeat offenders in that category.

'Every single time I've been in labor. Men (not even fathers) try to mansplain to me what I should be doing,' someone else tweeted.

Another woman said a man had once lectured her on breastfeeding as she was nursing her baby, and another revealed she had once received a not so helpful talk regarding the effects of pregnancy on her body.

Repeat offenders: One woman complained that men attempted to tell her what she should be doing while in labor every time she gave birth

Just don't: Men can become guilty of mansplaining when trying to explain something to a woman, typically unnecessarily and condescendingly

No: Mansplaining also occurs in the realm of academic or professional knowledge, with men attempting to teach women things in areas they know extensively due to their occupations

Out of line: On a similar note, some men apparently tried to teach women about their own cultures, again disregarding the fact they probably knew their heritage

Mansplaining also occurs in the realm of academic or professional knowledge, with men attempting to teach women things in areas they know extensively due to their occupations.

One woman said a man had once tried to explain to her 'how to search our library catalog using author and title', even though she's a librarian.

Another was given an unnecessary crash course on tax deductions, despite the fact she's a certified public accountant.

Meanwhile, a female chef once encountered a man who took it upon himself to tell her how to put oil into a pan.

On a similar note, some men apparently tried to teach women about their own cultures, again disregarding the fact they probably knew their heritage in more details than them.

'When my husband was explaining how to properly pronounce Greek. Greek is my native language, he grew up in Georgia in a Jewish household,' one woman wrote.

Some of the mansplaining occurrences appear just plainly unnecessary. Someone said a man had once tried to tell them how to pronounce their own names.

Others just appear scientifically questionable, with one woman writing: 'A male ob/gyn told me that if I focused harder on my work or picked up an interesting hobby my menstrual cramps wouldn't bother me so much.'