Correct

卖嘴

/ mài zuǐ / 
Strokes

Example

As a Verb

show off one's skill, ability or kindheartedness by talking; indulge in clever talk

1
Tā
他
zhī
只
huì
会
mài
卖
zuǐ
嘴
  
,
méiyǒu
没有
xíngdòng
行动
  
。

He is all talk and no action.