laugh your head off

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

rir muito, rir às gargalhadas

to laugh very loudly and for a long time

:
The comedian was so funny, we were all laughing our heads off.
O comediante era tão engraçado, estávamos todos rindo muito.
I told him a joke and he started to laugh his head off.
Eu contei uma piada para ele e ele começou a rir muito.