A tongue-in-cheek term for when a woman responds to a conversation by over-explaining, correcting, or asserting expertise in a way that feels unnecessary or condescending, often shifting the interaction from discussion to correction. The behavior is sometimes perceived as stemming from defensiveness or a need to prove knowledge.
I pointed out the lot size inconsistency, but instead of addressing it she went straight into ladysplaining basic square footage math like that was ever the question.