Piss (oneself) laughing British slang rude
If one pisses himself/herself laughing, it means that he/ she laughs in an uncontrollable or crazy way.
We can't stop pissing ourselves laughing throughout of the film.
We are so lucky to have a hilarious teacher. Yesterday, we were pissing ourselves laughing during the lesson.
The verb “piss" should be conjugated according to its tense.
People tend to remember the bad things others do and while they easily forget or get rid of others' good things.