Kool-Aid smile

Meanings:

1.
United StatesPopular cultureinformalcolloquialslang
- A broad, often conspicuously cheerful or enthusiastic smile that suggests unquestioning optimism or blind allegiance.
- A grin that conveys eager, possibly naive or uncritical acceptance of an idea, brand, leader, or cause.
2.
General Englishinformalcolloquial
- A forced or insincere smile intended to show support or approval, sometimes with ironic or mocking connotations.

EN: - To leave the mastering plant and know that that's on the way to the manufacturing plant, you know, I had the big Kool-Aid smile.
ES: Dejar el lugar en el que hicimos el máster del álbum y saber que va camino a su fabricación me hace sonreír con esa gran sonrisa tipo propaganda de Kool-Aid.
EN: What's with the Kool-Aid smile?
ES: ¿Qué hay con la sonrisa carismática?
ID: Ada apa dengan senyum itu?
EN: Judging by his Kool-Aid smile, let's hope his kryptonite.
ID: Berdasarkan senyum manisnya, kuharap kelemahannya.