split (one's) 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

Also, laugh one's head off. Be extremely amused, laugh uproariously. For example, That comedian had us splitting our sides, or Jane laughed her head off when she saw Rob's costume. The first of these hyperbolic terms dates from about 1700.
See also: side, split
The American Heritage® Dictionary of Idioms by Christine Ammer.

split your sides

be convulsed with laughter. informal
See also: side, split
Farlex Partner Idioms Dictionary

split your ˈsides (laughing/with laughter)

laugh a lot; laugh loudly: When she started singing in that funny voice, we nearly split our sides.
See also: side, split
Farlex Partner Idioms Dictionary

split one's sides

To laugh heartily.
See also: side, split
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • split one's sides
  • split 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 head off
  • laugh your head off