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

simple past tense and past participle of talk shit

Third-person singular simple present indicative form of talk shit

present participle of talk shit

(vulgar) Speaking disrespectfully will incur physical violence.