「粗口爛舌」

(pos:形容詞)
<explanation>
yue:講嘢講得好粗魯、#爛口，成日講#粗口
eng:swearing a lot; using a lot of bad language; speaking "foul language" all the time
<eg>
yue:佢自己都粗口爛舌，好難叫佢啲細路唔講。 (keoi5 zi6 gei2 dou1 cou1 hau2 laan6 sit3, hou2 naan4 giu3 keoi5 di1 sai3 lou6 m4 gong2.)
eng:It's hard to tell his children not to swear when he's cursing like a sailor.