split sides

split (one's) sides

To laugh uproariously or hysterically. Your jokes are perfect for your speech tonight. You'll have them splitting their sides!
See also: side, split
Farlex Dictionary of Idioms.

split one's sides (with laughter)

Fig. to laugh so hard that one's sides almost split. (Always an exaggeration.) The members of the audience almost split their sides with laughter. When I heard what happened to Patricia, I almost split my sides.
See also: side, split
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

split one's sides, to

To laugh uproariously. This hyperbole dates from the seventeenth century. Thomas Brown used it in Saints in Uproar (1687): “You’d break a man’s sides with laughing.” The word “split” came into use somewhat later. Dickens used it in The Old Curiosity Shop (1840), “He bade fair to split his sides with laughing,” and Harriet Beecher Stowe in Uncle Tom’s Cabin (1852), “I laughed fit to split.” See also shake with laughter.
See also: split
The Dictionary of Clichés by Christine Ammer
See also:
  • split (one's) sides
  • split one's sides
  • split your sides
  • split a gut
  • split a/(one's) gut
  • have (one) rolling in the aisles
  • have people rolling in the aisles
  • laugh (one's) head off
  • laugh head off
References in periodicals archive
In all, Split Sides can be 'mixed' in 72 different ways.
WHY would a joke that can split sides in the north produce only a stony silence in the south?
I'm pleased to hear Donald Dewar is suffering from nothing more than split sides.
The "concomitant" risk of spending an hour on the Hotline includes bouts of earache and an occasional case of split sides.
More than a dozen company engagements at BAM over the years include the troupe's venue debut in 1966; its first extended season in 1968; Split Sides (2003), with live music by Radiohead and Sigur Ros; and the celebration of Cunningham's birthday with the premiere of Nearly Ninety in 2009.
FANS of political sitcom The Thick Of It will be suffering deja vu (and split sides) over Gordon Brown's "bigoted woman" outburst.