laugh your head off
US /læf jʊər hɛd ɔf/
UK /læf jʊər hɛd ɔf/

1.
reírse a carcajadas, partirse de risa
to laugh very loudly and for a long time
:
•
The comedian was so funny, we were all laughing our heads off.
El comediante era tan divertido que todos nos estábamos riendo a carcajadas.
•
I told him a joke and he started to laugh his head off.
Le conté un chiste y empezó a reírse a carcajadas.