split your sides

• laughingMaking sounds of amusement
• hilariousExtremely amusing
• roaringMaking prolonged loud noise
• howlingProlonged mournful crying sound
• cracking upLaughing until helpless

belly laugh · hysterical · giggling · guffaw · tears · stitches · doubled over · cackling · snorting · wheeze · comedy · joke · punchline · comedian · uproarious · sidesplitting · funny · rolling