Man-on-mansplaining 

the explanation of something by a man, to another man who they perceive as their inferior, in a manner regarded as condescending or patronizing.

There was a lot of man-on-mansplaining in the office today between Bert and Matt.

Man-on-mansplaining by Fz9g3z September 10, 2019

milsplaining

milsplaining (blend word ‘military’ & informal form splaining of gerund ‘explaining’) is pejorative term meaning "(of a squaddie) to comment on or explain something to #civvy in condescending, overconfident, often inaccurate or oversimplified manner"
It is total bravado based on a rigid hierarchy where people have to do exactly as you tell them even if you are an utter knob. Civvies don’t give a shit about rank & will tell you to poke it.

I’m not #milsplaining you thick Civvy twat, I’m giving you guidance based on my considerable military knowledge gleamed from Commando comics & years of mucking other military around. I have zero knowledge of real world but if I shout & point, you will have to do what I say!

milsplaining by Bumsnorkler December 4, 2019

Maxplaining

Max Verstappen explaining things to his fellow drivers

Ahh there goes there's Max Maxplaining Charles again!

Maxplaining by Omgjustgivemeanyname September 22, 2022

fansplaining 

When a fan tries to explain something to a pro athlete, coach, GM or entertainer about the pro's craft. Takeoff of mansplaining.

(fan) "If you open your batting stance, you'll see the ball better."
(pro athlete) "Quit fansplaining! I'm the pro athlete, not you!"

fansplaining by The Runs June 10, 2017

Tansplaining 

When a British person (tan) explains something thats blantantly obvious/false in a condescending manner to an Irish person because they're British, think they're "great" and have no grasp on their countries history.

"You know you Irish should say thanks to us if we didn't invade you you'd still be picking potatoes"
"Class tansplaining"

Tansplaining by Glue Potter November 7, 2019

Mannsplaining 

The gritted teeth repetition of facts from a scientist forced to contend with the myths of morons all the livelong day.

"Michael's having a bad day on Twitter; he's gonna graduate from Mannsplaining to murder pretty soon."

Mannsplaining by Recovering Pagan April 20, 2020

Mathsplaining 

When a mathematically capable person explains a math problem to a less mathematically capable person, typically in a manner regarded as condescending or patronising. Like mansplaining, except that it actually exists.

Math HL student: "Uh, you can't get the square root out of a negative number. Unless you're using irrationals"
Math studies student: "Stop mathsplaining to me!"

Mathsplaining by FanterPanter December 10, 2017