Definition of talk through one's hat or British arse or backside or US ass in English:

talk through one's hat (or British arse or backside or US ass)

informal Talk foolishly, wildly, or ignorantly: come on, you’re talking through your hat on that
More example sentences
  • And for me to say anything about the intelligence dispute would be talking through my hat.
  • Good thing he's so electable, or he might have to stop talking through his hat.
  • I'm afraid, my old darling, that you are talking through your hat.
See parent entry: talk

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Pronunciation: ˌəʊlɪˈadʒɪnəs
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rich in, covered with, or producing oil; oily