trash talk
noun /ˈtræʃ tɔːk/
/ˈtræʃ tɔːk/
(also trash talking)
[uncountable] (North American English, informal)- a way of talking that is intended to make somebody, especially an opponent, feel less confident
compare sledging口水战(为令对手等丧失自信心);打击对手士气的言论