You have two great responses to your question. Now please note my corrections to your post above, in red. Remember to follow these rules of written English:
- Start every sentence with a capital letter.
- End every sentence with a single, appropriate punctuation mark.
- Always capitalise the word "I".
- Do not put a space before a comma, full stop, question mark or exclamation mark.
- Always put a space after a comma, full stop, question mark or exclamation mark.
It helps if you enclose the words you are querying inside quotation mark (as I have added above).
Good point. The phrase is "to XXX one's head off". Various things can be applied there but the most common one is "laugh". One of my favourite jokes as a child was:
- What goes "Ha, ha, bonk"?
- A man laughing his head off!