D defs.my
Entry 1 sense Webster, 1913

umpteen

· ump·teen · IPA /ˈʌmp.tiːn/
01 a. An indefinite number, usu. more than ten and less than one hundred; a lot. Often used hyperbolically, and usually expressing the notion of…
  1. 1.
    An indefinite number, usu. more than ten and less than one hundred; a lot. Often used hyperbolically, and usually expressing the notion of more than the usual number or more than I would like.[Colloq.]