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5.
The origin of the term is commonly associated with the Battle of Belleau Wood which took place in France during the First World War. The Germans were shocked at the ferocity of the attacking U.S. Marines (elements of the 5th and 6th Marine Regiments) and called them "Teufelhunde" which loosely translates to "Devil dog". After the battle, the French renamed it "Bois de la Brigade de Marine" ("Wood of the Marine Brigade").

1. Commonly used to address another Marine and has no real negative connotations (unless spoken sarcastically, at which point the speaker is likely to spring a rather nasty leak).

2. Used to address a Marine who's name is not known (before nametapes on the utility uniform became standard).

"Let's go, Devildogs... MOUNT UP!"

"Hey Devildog, what unit you with?"
by USMCG_Spyder December 28, 2005
 
1.
A devil dog is a member of the United States Marine Corps. It originates from a statement attributed to the German High Command, in remarking on the determinedness of the Marines, to the effect of "Wer sind diese Teufelshunde ?", which means "Who are these Devil Dogs?"
by Timbabwe June 17, 2003
 
2.
A devil dog is a member of the United States Marine Corps. It originates from a statement attributed to the German High Command, in remarking on the determinedness of the Marines, to the effect of "Wie sind die Teufelhundern ?", which means "Who are these Devil Dogs?"
The Marines have taken the comment as a compliment to their fighting ability, and refer to their comrades as "devil dogs": "hey there, devil dog" is a friendly greeting between Marines.
by Maximus March 13, 2003
 
3.
A term given to Marines by the Germans in WWI at the Battle of Beleau Wood in France. During the battle, the Marines charged into the German trenches through mustard gas (which made their eyes red), and faught with such ferocity that the dying Germans called them devil dogs. The term is still used today between Marines as a motivational nickname.
"Semper Fi, devil dog!"

"Hey there devil dog, you keep shooting like that and there won't be any enemy for the rest of us."
by Paul June 19, 2006
 
4.
A nickname for the U.S. Marines
let's go devil dogs
by reconmarine February 18, 2009
 
6.
A member of the US Marines often used in friendly conversation
Hey, bro, you a devil dawg too?
by The DON October 16, 2002
 
7.
Nickname of a United States Marine. Taken from the word "teufel-hunden" that was the name given by many Germans in WW1 to attacking Marines.
Hey DevilDog, home over here.
by DevilDogWA October 15, 2005