micahtransactions 

Refers to microtransactions in Red Dead Redemption 2: online, with the Micah-part referring to the main antagonist of the offline story mode.
It is usually used to show discontent over the overpriced nature of them.

Two weeks after the release of the online beta of rdr 2, Rockstar decided to implement micahtransactions in the form of gold bars.

micahtransactions by Mrhandle December 14, 2018

microtransactions 

when you have sexual intercourse and/or ejaculation while having a micropenis

Johnny came over last night and gave me some good microtransactions with his tiny dick

microtransactions by Karab okama December 1, 2020

micahtransaction

A play on the word "Microtransaction", used in Red Dead Online, where purchasing microtransactions are related with the antagonist Micah from the story of Red Dead Redemption 2 in a attempt to credit and deem microtransactions as unethical and immoral to purchase and the morally opposite of being an "Arthur", which would indicate somebody that does not purchase microtransactions.

Came to existance because of the popular stance against Rockstar Games' heavy use of microtransactions in their multiplayer games such as GTA Online and to discourage people from purchasing microtransactions.

Person1: "I'm thinking about buying some gold bars bro, this takes way too long to grind"
Person2: "Bro, are you crazy? are you seriously going to go down the path of micahtransactions? That's sad dude, think about Arthur"
Person1: "Your right, that's very Micah to do"

micahtransaction by gavins friend November 30, 2018

Micahtransaciton 

The ploy used by Rockstar Games in the old western video game Red Dead Redemption 2 to make players pay real money for in game items.

Name originates from a character in the main story of the game named Micah, who in the and completely ruins life for everyone.

Hey how much is it to buy that gun barrel skin without Micahtransactions? "Only 36 hours of mission grinding" Micahtransaciton: Paying real money for fake money

Micahtransaciton by MarstonUFool December 14, 2018