Вот интересно, вы так в жизни говорите? Вы действительно говорите "Я имею другой сэндвич"? Русский ваш родной язык?

This is an insult along the lines of "eat another sandwich - you're not fat enough!"

Gosh, I've never heard this one before :))

hahaha, it's awful. And if someone's too skinny, they say "Have a sandwich!"

It's like "get him another whopper" - you'll never guess unless you know :)

That's right, Elena. And discovering these little inside jokes is such an exciting part of learning a new language :-)