Indefinitely or innumerably large in amount. An old-fashioned variant of "umpteenth." (Used for sarcastic or hyperbolic emphasis.) For the umpty-umpth time, we are not stopping for ice cream! I'm sorry for snapping at you like that, but you're the umpty-umpth person to come ask me about the issue today.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
umpty-umpthand umpteenth (ˈəmptiˈəmpθ and ˈəmpˈtintθ)
mod. thousandth, billionth, zillionth, etc. (Represents some very large but indefinite number.) This is the umpty-umpth time I’ve told you to keep your dog out of my yard.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.