someone who tries over and over again but can never succeed, it's just not in the cards for them. they will always fail to fulfill the expectations of others, and will constantly create continual disappoint throughout their lifetime. they are undependable and wreak of failure.
Quinn 'The Letdown' Martin
by your secret admirer9 March 16, 2010
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The act of letting your friends down at the last minute for an activity or event.
We had everything booked for the trip, everyone else is coming but Aisling's a letdown
by Riggybotten March 12, 2009
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The New England Patriots 2007 NFL season.
The Pats just got their ass handed to them by the Giant inside the last two minutes. That's a letdown if I've ever heard one.
by skipatrol8 February 4, 2008
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A frustrating situation when after feeding a guy booze and listening to him talk about himself all night at the bar, you get him home and as you take off his pants you're dissapointed to find that he has a teeny tiny penis.
Steve: "I thought I'd picked up a good fuck for the night then I suffered Lunchbox Letdown."

Kyle: "I hate that!"

Steve: "It was tiny AND crooked, fucksakes."
by jdiddy77 January 20, 2012
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A lunchbag letdown occurs when something you had been looking forward to turns out to be far worse than originally anticipated.

The term originates in the lunchroom (be it school or office or otherwise) where after a long hard day someone sits down with their lunchbag hoping for something tasty. Instead they find something unappetizing, whether it be the wrong lunch, it's moldy, it's cold, or any other multitude of problems.

After such a situation, it can be said that your lunchbag was indeed a let down.
Tom: I can't wait for lunch *pulls out lunchbag*

Jim: What do you got?

Tom: Aw man! Tunafish? I HATE Tunafish!

Jim: What a lunchbag letdown.
by Piemanthe3rd August 17, 2010
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When you become a teenager and you realize that all the things you thought you could do when you were a child...you can't.
my worst teenage letdown was when i realized i wasnt going to be the youngest traveling lion tamer in southwest michigan.
by Angelacia May 3, 2007
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