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oishii dayo 

In japanese, expression showing the full satisfaction obtained by eating, drinking or tasting anyway, somethings really delicious (delicious is what oishii properly means), mostly, but not necessarily, related to food or drink.
Coming from the Imperial Family and the noble class of the Heian period (794-1185 AC), it's still mainly used among highly educated people and academic circles, as a way of very polite and formal appreciation, sometimes just in order to mark the intellectual superiority from the common way of speaking.
oishii dayo by ossiandream December 27, 2007
Related Words

nani sore? oishii no? 

A somewhat of a dead meme in Japan that you might hear a Japanese native say. It is often used when someone uses some fancy/obscure English or Japanese word that the listener doesn't know. Literally translated, it means "What is that? Is it delicious?". It has nothing to do with food though. 「Written in Japanese (with 漢字) -> 何それ?美味しいの?」

PS: Thank you Japanese Ammo with Misa
Shakespeare: Look thou be true; do not give dalliance, To the fire i' the blood: be more abstemious...

Every edgy highschooler ever: nani sore? oishii no?
nani sore? oishii no? by faichaan September 6, 2020
J: Sorry, but you aren't invited

D:So you invited that creepy loser girl to your party but not me, your best friend? Oichii
oichii by DevinaROSE June 30, 2009
Japanese man eats a sushi.
"Oishi," he says to the stranger next to him.
oishi by sukebe December 27, 2006
An Oishi is a dreamer. They have wonderful smiles with the bestest dimples and are warm friends. Oishis are food and art connoisseurs and love to appreciate the simple things in life. Are insecure and have hearts that are a little fragile only because they are full of so much love to give. Oishis are witty and wild and can be found cursing computer science engineering projects at wee hours of the night.
That girl's smile just made my day, she must be an Oishi !
Oishi by orangejuicetea February 10, 2019

oishoi madö 

It means oishoi madö you dumbshit
He’s a little oishoi madö
oishoi madö by Littleassnigga July 12, 2022