A man who was a meat checker in the Civil War who stamped safe meat with a stamp that said US as in United States, but that act what interpreted as Uncle Sam. They used him as a figurehead on posters for men to join the union army.

Also one of my relatives, whether you believe me or not.
Dude, did you see that poster in the hall? Uncle Sam wants me again! Freaking army men(:
by Erinnn(: March 04, 2009

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*A legendary figurehead of the United States. Although mythical, he is reported to have been a real person. Uncle Sam is basically a tall man with white hair (with a white goatee), dressed in the Red, White & Blue, with the Stars & Stripes as a huge hat. Uncle Sam, along with this description, is commonly portrayed as this old-looking, but tough-as-nails, figurehead pointing at you, the viewer of the poster, and below it he's saying "I Want You".
Uncle Sam basically represents the US Government, although he greatly represents the US Military.

*Sam Fisher's alias in a mission during Splinter Cell : Pandora Tomorrow.

*An appropriate name for anyone in the military named Sam. This name may not be appropriate for females named Sam though.
Libby-Lib : "*puts on Stars & Stripes hat and then points* I want you so I can screw your children over by sending them to ficticious wars!"
Me : "....not funny."

Me : "puts on Stars & Stripes hat and then points" I want you. ^.^
Hottie : "*has a confused look*"
by Dave June 29, 2004

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The federal government.
Bill cheats on his taxes, because he hates Uncle Sam taking his money.
by Alan May 09, 2004

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the only man not prosecutable for treason or war crimes
Person 1: Why is it the US can murder people in every country as they drive their institutions to starve and violate every human right of their own citizens?

person 2: Cuz it's the American dream to be able to do anything you can put your mind and wallet to. You know...Uncle Sam.
by United States of Notmyfault February 05, 2010

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Jizzing on one's hand and giving a person a five star slap thus coloring them red, white, and blue
My roommate was being a dick so I gave him an Uncle Sam.
by Fabestan February 06, 2011

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Where you cum onto a girls face but only on the chin so she has a white beard.
Where cum lands on someones face to where they look like they have a white beard like Uncle Sam.
by MaddhatterCrow August 11, 2016

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The ultimate combo move. Instruct her to gargle blue Powerade when getting head than begin the procedure for a jelly doughnut. Make her laugh to create an angry dragon and finish by saluting and humming the star-spangled banner.
The uncle sam is my favourite patriotic theme sex move, even if it does turn her tongue blue.
by JDW May 02, 2005

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