"wet your pants" in Chinese (Simplified)
尿裤子吓尿裤子（比喻）
Definition
因害怕、发笑或来不及上厕所而不小心尿在裤子里。既可作字面意思，也可用于幽默语境。
Usage Notes (Chinese (Simplified))
该表达极为口语化，多用于开玩笑或尴尬场合。常见如“笑尿裤子”、“吓尿裤子”。正式场合避免使用。
Examples
He laughed so hard he wet his pants.
他笑得太厉害，**尿裤子了**。
The little boy wet his pants at school.
小男孩在学校**尿裤子了**。
Did you ever wet your pants as a kid?
你小时候有没有**尿过裤子**？
I was so scared during the horror movie, I nearly wet my pants!
我看恐怖片时太害怕，差点**尿裤子**！
She tried to hold it in, but ended up wetting her pants on the bus.
她试图憋住，但最后在公交车上**尿裤子了**。
Don't drink too much soda, or you might wet your pants on the trip!
别喝太多汽水，不然旅途中可能会**尿裤子**！