a dog's breakfast 

Very simply -- Vomit.

Have you ever seen a dog eating vomit?

Usually refers to the vomit resulting from a full night's drinking, hence, being so drunk, one vomits in the street, and, being that drunk, one has usually acted very stupid throughout the evening. The phrase "A dog's breakfast" is usually attributed to the way one has acted prior to the resulting vomiting. Phrase popularized by the sit-com Kath and Kim (AUS).

Sharon was totally out of control at my bachelorette party -- she really made a dog's breakfast of herself!

a dog's breakfast by K & K FAN August 7, 2006

a dog's head in a box 

this term refers to when you were being threatened by someone most likely the mob sends you dogs head in a box

Person 1: Whats in the box?
Person 2: IDK lets check
*Sees the head*
Person 1: No McSnuggleston the III who did this to you
Person 2: Theres a note
"Who names their dog McSnuggleston the III THERES NOT EVEN I OR II"
This is an example of "A dog's head in a box"

a dog's head in a box by oi bloody cunt May 24, 2021

I’d eat a dog’s ass! 

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!

I’d eat a dog’s ass! by Dr Bunnygirl July 5, 2021

Raining up a dog's ass 

When it rains so hard that the rain is bouncing off the sidewalk and potentially up a dog's ass.

Be sure to bring an umbrella, the weatherman said there's a 70% chance that it will be raining up a dog's ass by this evening.

Raining up a dog's ass by AtomicSquid February 2, 2010

Finer than a dog's hair split three ways 

Means that something is very fine, or that you feel excellent. If someone asks how you feel and you simply say "fine", you might just be saying it out of convention. Adding the "dog's hair split three ways" shows that you actually mean it.

Another form of the expression is "finer than a frog's hair split three ways", although literal frogs do not have hair.

You: How are you doing today?

Me: Why, I'm doing finer than a dog's hair split three ways!

Finer than a dog's hair split three ways by JCEG November 25, 2006

thicker than hair on a dog's back 

Dogs have so much hair that they have to shed it a couple of times a year.

Traffic in Atlanta is thicker than hair on a dog's back during rush hour.

thicker than hair on a dog's back by Deborah Lee June 11, 2006

making out with a dog's ass 

just another accepted form of marriage in San Francisco

what a disgusting fucked up place California is...

making out with a dog's ass by ewww August 12, 2004