They're screening "The Wizard of Oz" again for the umpteenth time.umpteenth adjectiveumpteenth adjective
umpteenump‧teen /ˌʌmpˈtiːn◂/ det informal 
COLLOCATIONS FROM THE ENTRY They're screening "The Wizard of Oz" again for the umpteenth time.
very many – used especially when you are annoyed there are so many: They're screening "The Wizard of Oz" again for the umpteenth time. There seemed to be umpteen rules and regulations to learn. She’d called the apartment umpteen times, but never got an answer.—umpteenth adjective: They're screening "The Wizard of Oz" again for the umpteenth time.umpteenth adjectiveumpteenth adjective
umpteenthump‧teenth /ˌʌmpˈtiːnθ◂/ adjective [only before noun] WORD ORIGINumpteenth
Origin:
1900-2000 umpty ‘many’ (a joke word) (1900-2000) + -teenth (as in thirteenth)COLLOCATIONS FROM THE ENTRY ‘This is crazy,’ she told herself for the umpteenth time.COLLOCATIONS FROM OTHER ENTRIES They're screening "The Wizard of Oz" again for the umpteenth time.
if something happens for the umpteenth time, it happens again after having happened many times before – used when you are annoyed that it has happened so often: ‘This is crazy,’ she told herself for the umpteenth time. They're screening "The Wizard of Oz" again for the umpteenth time. ‘This is crazy,’ she told herself for the umpteenth time.