Verb (transplaining, transplained). To "explain" the so-called "facts" of a transgender fantasy using circular reasoning and post-modern nonsense words. Usually accompanied by character attacks and other logical fallacies. Common among SJWs and students of gender studies. Similar to the verb "mansplain", but with a right-on lefty twinge.
by jouissancepastance June 24, 2017
Essentially when a trans person assumes a non-trans person lacks knowledge in an area where she (or he) is known to be an expert
Cis-gendered person: I cannot believe Dylan just transplained to me about the difference between men and woman. That dude is transplaining me.
by Chuckster7411 April 21, 2023