when a gymnast can not stay on the beam at all during a practice they may self diagnose themselves or a teammate may diagnose them with beamitis
âRachel can not land her back handspring at all today! I think she has beamitis!â
or
âI literally can not make my aerial on beam today I think I have beamitis.â
Used as an insult in the third installment of the Harry Potter series, Harry Potter and the Prisoner of Azkaban.
"You two shopping for your new dream home? Bit grand for you, isn't it, Weaselbee? Don't your family all sleep in... one room? " Draco as Ron is looking at the Shrieking Shack with Hermione.