This is the 9656th most frequent German word.
mülls
The German word "Mülls" is not standard; it appears to be a possessive form or a colloquial entry. However, "Müll" translates to "trash" or "garbage" in English.
In this sentence, 'Müllsack' refers to a garbage bag. 'Müll' is used as a root word in a compound noun.
Ich bringe den Müllsack nach draußen.
I take the garbage bag outside.
Here, 'Mülls' represents 'of the waste,' showing possession in Genitive form.
Die Qualität des Mülls hat zugenommen.
The quality of the waste has increased.
In this context, 'Mülls' seems to be a misuse or typographical error; the correct form should simply be 'Müll,' meaning garbage or waste.