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latin word meaning "always faithful" also the moto of USMC (the greatest fighting force ever constructed)
once a mairne, always a marine. semper fidelis. always faithful.
by !USMC2010 March 24, 2010

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Semper Fidelis is a march written by John Philip Sousa in 1888. Sousa was known as the American March King, a member of the United States Marine Corp Band, he wrote this march which became the official march for the Marine Corp. He also wrote Star and Stripes Forever the national march of the United States of America.
by bandmember July 04, 2013

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Something said when something really exciting or cool happens.
Hey Slap Nuts! I just robbed a prostitute!

That's Semper Fidelis
by Tinkle Toys April 20, 2010

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt