This is the 14524th most frequent Russian word.
париться
To sweat, steam (e.g., in a sauna), or to worry/stress.
Here, "париться" means to worry or stress out, often used in casual, reassuring contexts.
Не парься из-за экзамена, всё будет хорошо.
Don't stress about the exam, everything will be alright.
In this sentence, "париться" refers to the act of steaming in a sauna, a common activity in Russian culture.
Мы решили париться в бане после долгого рабочего дня.
We decided to steam in the sauna after a long workday.
Here, "париться" is being used to indicate excessive worrying, typically implying unnecessary concern for unimportant matters.