501st 

The 501st Legion is a worldwide Star Wars costuming organization comprised of and operated by Star Wars fans. While it is not sponsored by Lucasfilm Ltd., it is Lucasfilm's preferred Imperial costuming group. Star Wars, its characters, costumes, and all associated items are the intellectual property of Lucasfilm. ©2011 Lucasfilm Ltd. & ™ All rights reserved. Used under authorization

For members of the 501st Legion, a worldwide organization of dedicated Star Wars fans, the Stormtrooper costume isn't just something seen on the movie screen -- it's a way of life.

501st by Well Spoken Man June 14, 2011

501st 

Also known as "Vader's Fist". The 501st Legion is the world's largest Star Wars costuming organization whose aims are to promote the Star Wars brand, celebrate fandom and contribute to the community through charity and volunteer work.

Dang! The 501st helped raise more than $3.4 million in charity last year by dressing up like Stormtroopers!

501st by 501st Legion June 14, 2011

50statepiss 

A goal or journey undertaken where one endeavors to piss on all 50 of the United States.

Guy 1: The wolf just pissed on your shoe, that means it's his now.
Guy 2: So what; I've completed my 50StatePiss. That means this whole country belongs to me.

50statepiss by cowtipn January 27, 2007

501s 

A pair of jeans or pants, specifically Levi 501's.

Levi 501's

I met a boy wearing Vans, 501s, and a dope beastie-tee, nipple rings...
Lyrics by TOOL

501s by Mr. BoJanggels November 30, 2006

51st State

Countries that are largeley dependant on the United Stated for one reason or another such as trade, aid money or military support

Israel, Mexico, Canada

51st State by Paul September 8, 2004

51st Base 

When two guys each get anally penetrated by 2 horses simlutaneously whilst jacking off their own father's that are licking your sister's anus as she shits all over his face.

Dude 1: I got to 51st base last night!
Dude 2: Dude, you're fucked up
Dude 3: Are you really sad enough to look through all of the definitions of bases until the 51st?

51st Base by YourMotherAndSister February 15, 2009

51st state

Countries that currently, or in recent history have depended upon the United States. Often used in an arrogant manner by some Americans who think that somehow showing support towards a nation should somehow give them a stake in that nation. Also often used by people noting that the culture of a country seems, or that a country shows a lot of support towards the US, or because of their cultural similarity to the US.

First usage: The United Kingdom due to the assistance from Americans in World War II, is sometimes a considered a 51st state.
Second usage: The United Kingdom is considered a 51st state due to their government's support of America in the Iraq war.

51st state by DavidJB May 11, 2006