Top Definition
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
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
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
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.