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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.
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!