laugh your head off

US /læf jʊər hɛd ɔf/
UK /læf jʊər hɛd ɔf/
"laugh your head off" picture
1.

смеяться до упаду, хохотать

to laugh very loudly and for a long time

:
The comedian was so funny, we were all laughing our heads off.
Комик был таким смешным, мы все смеялись до упаду.
I told him a joke and he started to laugh his head off.
Я рассказал ему шутку, и он начал смеяться до упаду.