sell short 

1) To sell something (usually a stock) that one does not own, with the anticipation that the item's value will decline and they will be able to buy it back at a later date for a lesser price.
2) To deny someone credit that they deserve. This is generally something a person does to him/herself.

1)
I sold your sister short last year for $100, then bought her back this year for a can of Skoal and a junior bacon cheeseburger. Damn that rag has really started to circle the drain.
2)
You: "So you're not going to let me beat it up, are you?"
Girl: "Nope, sorry. Denied! But don't sell yourself short...3 inches isn't really that small. At least you've got my chihuahua beat...I think."
(sell short)

sell short by Nick D September 8, 2005

a few sandwiches short of a picnic 

Someone who is not altogether in the mental sense; nevertheless someone who can be considered a blundering dumbass.

Dude 1: Why is that guy rolling little pieces of crap into shapes?
Dude 2: I believe he is "a few sandwiches short of a picnic" better let him be.

a few sandwiches short of a picnic by Nameless Here Forevermore July 16, 2008

Long Story Short 

Taking a long story and summarizing its main points, skipping over unnecessary details

I wanted to tell you all about my amazing day , but long story short, I totaled your car!!

Long Story Short by .PiCe.NuSSy. October 25, 2008

Taking the long horse for a short walk

Generally, this term is used by those who need to release urine. The symbolism of "long horse" and "short walk" are up to the user's interpretation.

John: You know, though our conversation is enthralling, I admit I must taking the long horse for a short walk. In other words, I must urinate, as you may know from the saying's entry on Urban Dictionary.
Jane: Ok.

Taking the long horse for a short walk by Long Horse Short Walk October 2, 2021

Life is Short 

Justification for any morally questionable behavior.

"Did you just throw acid in that child's face?"

"Life is short."

Life is Short by T. Barr June 28, 2008

Throw a Short Person Day 

On November 16th every year, you get to throw any person 5’4” and under.

Joseph: It’s November 16th, you know what that means
Albert: Go fuck yourself
Throw a Short Person Day gives you 5 free throw someone under 5’4” passes

Throw a Short Person Day by Datanigga November 12, 2020

Antony Short 

Professional obedience teacher and master hacker, Antony Short's master indefatigability and perspicacity is unmatched and makes him a feared opponent in any realm of human endeavor, including his experience in the military as as brutal war lord he is loved and feared by many for his famous information extraction torture method which is adopted by the CIA and other terrorist groups after losing one of his toes while held captive by a group known as isis he escaped while killing the leader in the process but lost his toe when he was tortured now he is retired and known as a hero by many.

i love antony short

Antony Short by thedoghandler69 August 26, 2022