rolling on the floor laughing my ass off

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rolling on the floor laughing (one's) ass off

Laughing uproariously, hysterically, or uncontrollably. A more emphatic, and more rude, version of "rolling on the floor laughing." Your jokes are perfect for your speech tonight. You'll have them rolling on the floor laughing their asses off! We were all rolling on the floor laughing our asses off because of all the silly things the party game had us doing.
See also: ass, floor, laugh, off, on, roll
Farlex Dictionary of Idioms.

rolling on the floor laughing (my ass off)

and ROTFL(MAO)
phr. & comp. abb. a description of how hard someone is laughing at someone else’s comments. (Usually objectionable.) ROTFLMAO! Gee, that was funny!
See also: ass, floor, laugh, off, on, roll
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • rolling on the floor laughing
  • be laughing (one's) head off
  • be laughing your head off
  • laughing in the aisles
  • aisle
  • be rolling in the aisles
  • laugh (one's) head off
  • laugh head off