partying
The Spanish phrase 'estar de fiesta' translates into English as 'partying'. The verb 'estar' typically refers to temporary states or conditions, like being in a certain mood or being at a certain place. The preposition 'de' usually implies possession, purpose, or cause, but in this context it implies the activity one is engaged in. Finally, 'fiesta' simply means party. So all together, 'estar de fiesta' connotes the state or condition of being engaged in a party, or in English vernacular, 'partying'.
Today we are celebrating because it is my birthday.
This phrase expresses the reason for the celebration, which is the speaker's birthday.
The family is celebrating at their daughter's wedding.
This example indicates that the family is in a festive mood due to the occasion of their daughter's wedding.
My friends are celebrating because of the end of exams.
This sentence highlights that the celebration is in response to the conclusion of exams, marking a moment of relief and joy.