Idiom of the day :- Laugh one’s head off

Usage, examples and definition of the Idiom :-

‘I was chatting with Felicity Frump at a party the other day,’ Michael grinned. When she began telling jokes, I laughed so hard I laughed my head off.’ What Michael is saying is that Felicity’s jokes were so funny they made him laugh and laugh. In fact, he laughed so much he couldn’t stop.