laugh your head off

[laugh/scream/shout etc.] your head off

to laugh/scream/shout etc. very much and very loudly He laughed his head off when he read the letter.
See also: head, laugh, off
References in periodicals archive ?
The only message from this show is laugh your head off.
Not the kind to make you laugh your head off anyway.
Someone comes along, tells the joke badly--you laugh your head off.