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

1.
大笑いする, 腹を抱えて笑う
to laugh very loudly and for a long time
:
•
The comedian was so funny, we were all laughing our heads off.
そのコメディアンはとても面白くて、私たちはみんな大笑いした。
•
I told him a joke and he started to laugh his head off.
彼に冗談を言ったら、彼は大笑いし始めた。