The act of a woman immediately dismissing or being triggered by someone's response, suggestion, opinion, criticism or feedback - regardless of how valid it may be - purely based on that person identifying as a straight, white, binary male.
Men who are gay, trans or ethnic minorities don't usually have to put up with this as often because... reasons?
Woman: Oh gee, thanks soooo much for MANSPLAINING that to me!
College Professor: I'm not "mansplaining". I'm your teacher, it's my job to point out where you've gone wrong. Now stop being so titsmissive and you might actually learn something.