The Horse's Name was Friday 

A phrase said in response to a question that makes no goddamn sense.

Joey: So if the train leaves Station B 15 minutes later, and the sun is 86° overhead, when will the shadows of the two trains be equal in length?
Brandon: The horse's name was Friday.

The Horse's Name was Friday by boughs.of.folly December 15, 2021

from the horse's mouth 

Information from the original source

The reports read were from the horse's mouth

from the horse's mouth by Jaymore November 27, 2017

(straight) from the horse's mouth

Getting information from the highest authority.

Origin:
When you get a tip for a horse race, the tip is better as nearer it is to the horse e.g. the jockey or the trainer. When you got it straight from the horse's mouth, you have it directly from the source.

This tip is foolproof, I got it (straight) from the horse's mouth!

(straight) from the horse's mouth by TheSunToucher August 12, 2009

putting words in the horse's mouth 

interrupting someone by finishing their sentences/words for them

boy, in an argument with his father:

boy: dad, sorry, I'll skip dinner tonight and (...)

father: (...) finish your chemistry and physics projects you are working on? That would be nice.

kodem koll, dad, stop putting words in the horse's mouth, and FYI it's actually Italian and Latin homework I was going to work on, later on the chemistry and physics.

putting words in the horse's mouth by Uncle Dimma April 28, 2014

straight from the horse's mouth

from the highest authority

i'm telling ya, it's true; straight from the horse's mouth!

straight from the horse's mouth by zoon July 1, 2005

to risk eating the horse's sperm 

When you have 50/50 odds that something could turn out just fine or be really, really awful, and you go on doing it anyway, you are taking a risk that you could be "eating the horse's sperm". Typically refers to sex acts, but not always.

From the Family Guy episode "Family Gay" in which Peter buys a retarded horse and fills the refrigerator with the horse's sperm to begin breeding it. He reveals it to the family while Stewie eats his cereal. He first looks shocked, then narrows his eyes and continues eating....

(Look up "Milky Surprise" at Hulu for the clip)

If you end up with the awful result, you can then said to have gotten the "milky surprise" (taken from the name of the clip at Hulu).

Steve: "So, I found out midway through the date that she is on drugs for being crazy, but I was hungry for companionship so I decided to risk eating the horse's sperm and took her home."

Heather: "And four month's later how's that working out for ya'?"

Steve: "Well I've had more than a few milky surprises. Bitch be crazy."

to risk eating the horse's sperm by Clintacus February 7, 2010

(straight) from the horse's mouth

from the most official source(from the fact that a horse's age can be determined most precisely and directly by examining it's teeth)

He gets his stories straight from the horse's mouth.

(straight) from the horse's mouth by Light Joker July 23, 2005