This is the 16069th most frequent Polish word.
tłuste
"Fatty" or "greasy."
Here, 'tłuste' describes the food, meaning it contains a high amount of fat.
To jest tłuste jedzenie.
This is fatty food.
In this context, 'tłusto' describes the appearance of skin, indicating it has excess oil.
Jego skóra wygląda tłusto.
His skin looks oily.
Here, 'tłustym' is used figuratively to describe a 'bold pen', referencing thick or noticeable lines made by it.