talk shit

From talk (“to speak of, to discuss”) + shit (“nonsense, "bullshit"”).

• Audio (General Australian):

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talk shit (third-person singular simple present talks shit, present participle talking shit, simple past and past participle talked shit)

1. (slang, vulgar) To untruthfully speak of another in a belittling, deprecative, slighting manner, either in person or in absentia.

   Synonyms: misrepresent, slander

   Talk shit, get hit.

2. (slang, vulgar) To speak nonsense or to lie.

   Synonyms: bullshit, misrepresent

   Yo, man, Bobby was here, an' he was talkin' all kinds of shit about how many girlfriends he's had; y'all know that he ain't had a girlfriend since a girl had him.

• This is an idiomatic instance of a general construction consisting of talk with the topic area as object of the verb. One can talk baseball, talk philosophy, or talk shop.

• (speak ill): talk trash (US), talk shite (UK); see also Thesaurus:defame
• (talk nonsense or lie): chat shit (UK), chat shite (UK), talk shite (UK)

• shit talk
• shit talking
• talk shit, get hit

• shit talk, shit-talk