Ever wondered what Sugoi Dekai means on Uzaki-chan's shirt? What does this expression so present in the anime mean? In this article, we will try to unravel its real meaning of Sugoi Dekai and its possible Mega Milk origin.
Table of Contents
What does Sugoi Dekai mean?

So you kept repairing my boobs during the anime?
Sugoi Dekai é uma expressão japonesa que costuma ser traduzida para o inglês como "too big!" ou "tão grande!" em português. Ela está presente na camisa da personagem Usaki-chan referindo-se aos seus enormes seios.
I personally don't like to translate the expression Sugoi Dekai this way; there are more interesting facts about the expression. Sugoi [凄い] can be translated as vast, intensely, very big, incredible, surprising, and wonderful.
Already dekai [でかい] can be translated as enormous; large and gigantic. That is, Sugoi Dekai can express the idea of something extremely giant, intensely large, surprisingly enormous and things like that.

and it is sometimes used to mean "Great!" The phrase became associated with Uzaki Hana from Uzaki-chan Wants To Hang Out!, a short character with large breasts who wears the shirt, which causes the shirt to be paired with other anime characters that have similarly large breasts like Mega Milk.
After the anime's release, there was an influx of artists drawing characters wearing Uzaki's characteristic shirt, similar to the Mega Milk meme; sometimes placing them next to a character with small breasts for contrast.
About Uzaki-chan wa Asobitai!

My name is Hana Uzaki, I am 150 centimeters tall, have silver hair, and a bust of 96 centimeters. I am energetic, confident, cheerful, and playful... I love to annoy and embarrass my Senpai, Shinichi.
The anime Uzaki-chan wa Asobitai!, which literally means Uzaki-chan wants to hang out (in English, go out to have fun), tells the story of a 19-year-old girl who likes to tease her friend while they stroll around the city.
The Uzaki-chan manga premiered on Niconico in December 2017 and began serialization on July 9, 2018. An anime adaptation was released in February 2020 by ENGI studios.

After the anime's release, some found the character's design inappropriate and made new designs to make her look older, thus generating a wave of varied memes of characters with Sugoi Dekai writing.
The anime generated a lot of debate because of the loli.
The origin of Mega Milk and Titty Monster?
It is very likely that the inspiration for Usaki-chan's t-shirt came from an adult doujin manga called Tiny Boobs Giant Tits History that tells the story of two siblings fighting and then getting together.

I can already see you looking for this manga on the internet...
After an image of a page from this manga was remade in color and posted on the 4chan forums in 2008, then came the great meme called Mega Milk and Titty Monster, which possibly gave rise to the Sugoi Dekai shirt.
The meme generally shows an image of a woman holding her own large cleavage with a crazy expression on her face ahegao, while wearing a shirt that says "Mega Milk".
The similarities between Uzaki-chan's and MegaMilk's shirt are so much that even the color is blue and white.

Where to buy Sugoi Dekai and Mega Milk Shirt?
Finally, let's leave some shirts and products related to Sugoi Dekai and Mega Milk, unfortunately some are not available in Brazil, only on Amazon Gringa and Japonesa (except Sketchbook).