sidesplittingly

/ˈsaɪdˌsplɪtɪŋli/
adverb
  1. In a way that is extremely funny; to a degree that causes uncontrollable laughter.
    • The comedian's timing was sidesplittingly perfect, and the audience roared with laughter.
    • He told the story sidesplittingly, imitating each character's voice and gestures.
    • The play was sidesplittingly funny, with every line delivering a punchline.
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