Definition of “laugh, shout, scream, etc. your head off” - English Dictionary

british dictionary

“laugh, shout, scream, etc. your head off” in British English

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laugh, shout, scream, etc. your head off

informal

C2 to laugh, shout, scream, etc. very noisily and for a long time:

There I was lying face down on the pavement and you two were laughing your heads off!

(Definition of “laugh, shout, scream, etc. your head off” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)