This is the 12489th most frequent Polish word.
najgorętszych
"Najgorętszych" means "the hottest" (plural form).
Here, 'najgorętszych' is used as a superlative adjective describing the intenseness of heat in days, using the genitive plural form.
To był jeden z najgorętszych dni w całym roku.
It was one of the hottest days in the whole year.
In this sentence, 'najgorętszych' refers metaphorically to events that are the most intense or trending, applied as a descriptive adjective in the plural genitive.
Rozmawialiśmy o najgorętszych wydarzeniach ostatniego tygodnia.
We talked about the hottest events of the past week.
Here, 'najgorętszych' describes discussions that are the most intense or controversial, using the genitive plural form as it is part of the prepositional phrase.