Correct

笑掉大牙

/ xiào diào dà yá / 
Strokes

Definition

to laugh one's head off/ridiculous/jaw-dropping

Example

Definition

(of a person) burst out laughing over the absurdity, ludicrousness of something; make one split one's sides with laughter; enough to make a cat laugh

1
Zhè
这
shì
事
yàoshi
要是
chuán
传
chūqù
出去
  
,
kěndìng
肯定
huì
会
ràng
让
rén
人
xiàodiào
笑掉
dàyá
大牙
  
。

If the story breaks, it will make people split their sides with laughter.

2
Ràng
让
rén
人
xiàodiào
笑掉
dàyá
大牙
de
的
jiànyì
建议

laughable suggestion