to bitching

se plaindre, râler

ˈb ɪ t͡ʃ ɪ ŋ → bitch
verb · present Rare #36,190
se plaindre, râler Familier et souvent vulgaire (plus fort que « se plaindre »).
EN: He was bitching about the weather all day.
FR: Il a râlé à propos du temps toute la journée.

What are they bitching about?

De quoi se plaignent-ils ?

— Infernal Affairs (2002)

Why you bitching?

Pourquoi tu te plains ?

— Elite Squad: The Enemy Within (2010)

You're already bitching?

Tu te plains déjà ?

— Elite Squad: The Enemy Within (2010)

Always bitching and complaining!

Toujours à se plaindre !

— Good Bye, Lenin! (2003)

Sounds similar to