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.
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!