Verb: Transplain; Third person present: transplains; past tense : transplained; past participle: transplained; gerund or past particple: transplaining

(Of a trans person) explaining (something) typically to a non trans person, usually about trans issues or identity/categorization in a manner regarded as condescending or patronizing.
'Jeremy called Doug by their old name ..Verna.. and now Doug has been transplainging to Jeremy about identify for the last half hour'
by Tyson Ardo May 16, 2020
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When a transgendered person (typically someone who is assigned male at birth) talks down to cisgendered people (typically cisgendered women) about various topics including biology, gender, gender expression, privilege, etc. Often it is an outlandish idea or talking point that when opposed by a cisgendered person the trans individual or followers of said individual will call the cisgendered person a bigot or transphobic for lack of a better argument.
Amab Transfemme: I take HRT and it gives me a period. I get tender breasts, cramps and I'm super hormonal at certain times of the month.

Cis woman: I'm sorry but that's not a period. You don't have a uterus or ovaries so that's physically impossible.

Amab transfemme: My period is very real to me! I do everything but bleed! You're being exclusionary to trans women! How privileged you are to be Cis! You're transphobic!

Cisgender woman: Did you just transplain my own bodily function to me?
by Lovely potatoes February 28, 2023
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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
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When a trans-person tries to explain your sexual identity or orientation to you contrary to the fact that this is a personal choice and everyone has the right to identify as they please.
Person A: I'm super-straight
Person B (trans): That's transphobic, genital preference isn't a sexual identity..
Person A: Please don't transplain to me, I know what I am and it's not for you to decide. Transplaining is superphobic.
by mexican_jesus March 11, 2021
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When a Transgender person or an ally tries explaining sexuality and science to Super Straight people and tries to invalidate their very real and valid identity in the process.
Trans: there's no such thing as a biological female read up on your science. And Super Straight can't be a sexuality it's a preference.

Super Straight: You're Transplaining. I don't know where you're going with this... But it's not in Super Straight pants.
by SuperMfundo March 10, 2021
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When a transgender person (generally who was previously male and has transitioned or is in the process of transitioning) continues to exhibit "mansplaining" behaviour, but not longer associates with that gender.
"OMG I was just showing them my makeup routine, and they started transplaining to me about why I shouldn't be using that foundation for my skin."
by mrteacher November 26, 2020
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When transgender individuals complain about their self-created drama to their eternal spouse Tumblr, under the impression that the rest of the world is to unquestioningly conform its will and behavior to their demented ramblings. Spinoff of mansplaining
TAL9000 is the transplaining champion.
by SwarmGoddammit September 22, 2013
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