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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?"
DevilDog by USMCG_Spyder December 28, 2005
Related Words

Devildoc 

Term of endearment applied by US Marines to their platoon-level medical personnel based on "Devildog". Unlike the other services the Marine Corps does not have a medical field, so we get ours from the Navy. A Hospital Corpsman is assigned to the platoon and he eats, sleeps, shits, fights and sometimes dies with "his" Marines.

A Corpsman is probably the single most highly respected member of the US Navy to an infantryman because he chooses to be there instead of some soft-ass REMF job. We treat them like a mascot and fuck with them constantly; within the platoon he's harassed about his branch of service, uniform, buddies, car, parents, girlfriend (or lack thereof), haircut (or lack thereof) and any manner of other things you know will rile him up.

Corpsmen tend to be highly protective of their Marines and there are many accounts of "Doc" coming to the aid of a wounded Marine under heavy enemy fire. John "Doc" Bradley is one example, winning the Navy Cross a short time after helping to raise the flag on Iwo Jima (he's one of the gentlemen immortalized on the monument).

The "Devildoc" is poked, prodded and ridiculed within the platoon (all in good fun, mind you), but let someone from outside the unit say one negative word about him and they can stand the fuck by. Any Marine worth his salt will buy a Devildoc a drink at the drop of a hat whether he knows him or not.

Also used when you're trying to buddy up to the Corpsman in order to get something from him.
Marine - "OORAH Devildoc!"
Corpsman - "Yeah, yeah... Whatever, Jarhead."

Marine - "Hey there, Devildoc. Wanna souvenir me one of those fuckin' cigarettes?"
Corpsman - "Golly gee, sure thing Marine! Take the pack!"
Corpsman *to himself* - "Broke-ass motherfucker..."
Devildoc by USMCG_Spyder January 1, 2006

Denilson 

A very outgoing, social person with a complicated personality. He's the life of the party and you'll always see him walking around with his head held high with confident and a bright smile on his face. He loves learning and is always on the go trying out new things. Though he can be mean and arrogant sometimes, he sure does know how to make a one laugh.
I like Denilson
Denilson by Chicflix November 23, 2021

devildogg 

the most leet TH on bartz
oh shit devildogg just pkd me
devildogg by devildogg May 9, 2005
Derildo the most caring and funny dad that can’t pronounce anything correctly
haha derildo is so funny
derildo by um ye May 11, 2021

denilove 

When someone is in love, but actively deny it. Whether it’s when others inquire about it or their own feelings.
Quit with the Denilove act bitch, you like him/her. >:(
denilove by ;) gloom March 25, 2021
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