Meaning of talk out of one's arse in English:

talk out of one's arse

(US talk out of one's ass, talk out one's ass)

phrase

vulgar slang
  • Talk foolishly, wildly, or ignorantly.

    talk nonsense, babble, ramble, gibber, burble, blather, blether, prate, prattle, gabble, chatter, twitter, maunder