Correct

走嘴

/ zǒuzuǐ / 
Strokes

Definition

a slip of the tongue/to blurt out (a secret or stupid mistake)

Example

As a Verb

make a slip of the tongue; let slip an inadvertent remark

1
Wǒ
我
běn
本
bù
不
xiǎng
想
shuō
说
  
,
zhǐshì
只是
wúyì
无意
zhōng
中
shuō
说
zǒu
走
le
了
zuǐ
嘴
  
。

I didn't mean to say that; it just slipped out.

2
Tā
她
shuō
说
zhāo
着
shuō
说
zhāo
着
jiù
就
zǒu
走
zuǐ
嘴
le
了
  
。

As she talked on and on, she blurted the secret out.

3
Qíngjí
情急
zhīzhōng
之中
  
,
tā
他
bǎ
把
huà
话
shuō
说
zǒu
走
zuǐ
嘴
le
了
  
。

Pressed, he made a slip of the tongue.