мы веселимся

are having fun, are enjoying ourselves

vʲ ɪ sʲ ɪ lʲ i m sʲ ə → веселиться
весел have fun, enjoy oneself + им 1st person plural present + ся Reflexive marker
verb · 1st-person plural, present tense Rare #51,401
are having fun, are enjoying ourselves
RU: Мы веселимся дома.
EN: We're having fun at home.
Conjugation of веселиться
Indicative present
SingularPlural
First — веселимся
Second — веселитесь
Third — веселятся

Поэтому мы веселимся.

That's why we're having fun.

— Виктория (2015)

Веселимся?

Having fun?

— Такси (1998)

Мы веселимся.

We’re having fun.

— Сенна (2010)

А мы тут страшно, страшно веселимся.

And here we are having a terribly, terribly fun time.

— Великая красота (2013)