When a male identifying person spends way too much time explaining something that is simple, or that is uninteresting to anyone (usually female identifying); also when a male spends way too much time explaining something to a female, who knows more about the subject than the male, because of the deeply embedded assumption that men "know more" than women
(Friend): How was your date?
(Straight Cis Woman): Oh, it was ok. He spent about 40 minutes mansplaining menustration to me.
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