Longman Dictionary of Contemporary English homepage

Date: 1900-2000
Origin: umpty 'many' (a joke word) (1900-2000) + -teenth (as in thirteenth)

umpteenth

 adjective
     
ump‧teenth [only before noun]
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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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