她们只是胡说八道。

They're just talking shit.

Source: Tatoeba

Sentence Composition

1 她们 tāmen they; them (females)
2 只是 zhǐshì
  1. merely; only; just; nothing but
  2. simply
  3. but; however
3 胡说八道 húshuōbādào to talk rubbish