Being in an extreme situation, so extreme that one is forced to eat the family dog and/or family members.

"They ran through the woods, for many nights, haunted by demons and other creatures of the night, in near panic, stopping only for the occasional piss. Steve was spared, but in desperation, Toto had to go."

"We had to _eat the dog_ on that excursion!"
by xxxMadelinexxx January 26, 2008
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Eat a dog challenge is where you find a rabid dog and use it to prepare a fine meal and eat it yourself or make someone else to eat it
Hey did you hear that uncle tom did the eat a dog challenge to his colleague
by mr ansley August 12, 2018
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A phrase some countryfolk types use to express that they’re ravenously hungry.
Honey, I’m so darn hungry, I’d eat a dog’s ass!
by Dr Bunnygirl July 5, 2021
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A phrase used to try and offend somewhen when fighting but really do not want to fight.
When billy bob yelled at jim bob,jim bob said, eat shit dog turd.
by bob michallison January 3, 2005
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what you say when someone pisses you off. also the terms:
I'm gonna SHIT ON YO COUCH!
I'm gonna CHEW ON YO BELLY BUTTON!
I'm gonna SNORT YO FERRET!
I'm gonna CUT YO HEAD OFF WITH A TOOTH BRUSH!
I'm gonna MAKE YOU TEABAG A CACTUS!
I'm gonna DROPKICK A BRICK WALL!
I'm gonna FART IN YO CEREAL
I'm gonna PISS IN YO LAMP
I'm gonna DRYHUMP YO TAMPON
I'm gonna PUKE IN YO SHOES
(fag's name here) is a stupid name
I'm gonna SQUAT IN YO SHRUBBERY
I'm gonna SPRAYPAINT YO HORSE! (NEIGH)
I'm gonna CHOP DOWN YO TREE WITH A FISH STICK
Jake: You're such a fag
Tyler: I'm gonna eat yo dog!
by jakedtyled January 24, 2010
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"Survival of the fittest" in its most literal definition. Everyone fends for themselves. If you can't take care of yourself, you get eliminated.
It's a dog eat dog world out there, and they're running out of napkins.
by MAP July 3, 2005
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"Dog eat dog" is analogous to the idiom "every man for himself", which implies a situation in which fierce deadly competition is necessary for your survival.

Some of these recent definitions seem to be offended at this saying due to their ignorance of the origin behind this 500 year old idiom. Some people do not seem to realize that this idiom is NOT meant to be taken literally. So, why is it called "dog eat dog" you may ask? Well, the idiom is actually a play on the much older latin idiom "dog does NOT eat dog" (canis caninam non est), which originated as early as 43 BC and first spoken by Roman scholar Marcus Tarentius Varro.

"Dog does not eat dog" is a proverbial saying indicating that even animals are better than humans in that they don’t prey on their own kind. The phrase entered into English discourse in 1543. Eventually, the phrase got flipped and applied to humans and henceforth "dog eat dog" was born. Both idioms generally imply the same thing (that humans are capable of being merciless).

So to summarize, the idiom "dog-eat-dog" is derived from its parent idiom "dog-does-not-eat-dog". The latter idiom makes sense in and of itself, while the former idiom ONLY makes sense in relation to its latter.
Me: It's a dog eat dog world out there.

Some kid: No it's not. It never was a dog eat dog world. Humans eat humans, but dogs don't eat dogs.

Me: My guy, you are so heavily misinformed. Dog eat dog isn't referring to dogs, it's referring to humans.

Some kid: So why don't they just name it "human eat human" instead?

Me: Because context my guy, it's all about context. You see... "dog eat dog" actually belongs to the much older idiom "dog does not eat dog", indicating that dogs never prey on their own kind. It took around 700 years for this idiom to become flipped and applied to humans.

Me: Also since you took it literally, I'll have you know that from an evolutionary standpoint, dogs will eat other dogs if this is what ensures their survival.
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