The term Grand Slam has been used in many games including baseball, tennis, golf and bridge.
To my knowledge, it has not been used in Pickleball. Until today: I had my first and undoubtedly my last Grand Slam: 11 serves in a row, 11 points in a row, won the game. My partner helped, of course.
Everyone was amazed, including me. I'd never seen this done. Never thought I would. Never thought about it at all.
It only took 50+ years of playing the game to do the GS. Not bad for an 81 year old, all modesty aside.