This is the 5527th most frequent Polish word.
tłusty
"Fat" or "greasy."
In this sentence, 'tłuste' is used metaphorically to describe years of abundance or prosperity.
Nadeszły tłuste lata dla naszej firmy.
Prosperous years have come for our company.
The word 'tłuste' refers to the nature of the dish containing a notable amount of fat or oil.
To danie jest bardzo tłuste.
This dish is very greasy.
The word 'tłusty' here conveys the idea of something thick or conspicuous, such as a bold print.