Peter gets in the office where he works and notices that Sally and Pamela are LAUGHING THEIR HEADS OFF.


PETER: Why are you laughing your heads off?
SALLY: Because Pamela has just told me that her boyfriend bought her a pink polka dot bikini.
PETER: I can't believe it!!! LOL (laughing out loud)
PAMELA: Oh no! Even Peter is laughing his head off now.

If you LAUGH YOUR HEAD OFF, you laugh a lot, loudly. When was the last time you laughed your head off?