Definition of laugh one's head off in English:

laugh one's head off

phrase

  • Laugh heartily or uncontrollably.

    ‘the audience laughed its head off all the way through the show’
    • ‘All I can say about that one is that I am laughing my head off!’
    • ‘He laughed his head off; and sure enough thought it was soo funny that he called anybody to let them know.’