baptising a billy goat 

The phrase "baptising a billy goat" is a phrase used mostly in the Southeast part of the United States. It is used to describe a useless activity that will produce no meaningful results. It is often concluded with the phrase "It's trouble for nothing."

John got caught red-handed with his bestfriend's girlfriend. Trying to convince his friend that he didn't mean anything by it was like "baptising a billy goat. It was trouble for nothing.
Or
Trying to get Dick Cheney to join the ACLU would be like baptising a billy goat. It's trouble for nothing.

baptising a billy goat by Bubba Hussein Ledbetter May 20, 2009

Lookin' up a dead goat's ass 

a futile effort, not worth pursuing

If you think I'm going to pay you the money I owe you then you're "lookin' up a dead goat's ass".

Lookin' up a dead goat's ass by SA Earl January 13, 2011

water goat 

Another name for an octopus.

Water goats have two eyes and four pairs of arms and, like other cephalopods, they are bilaterally symmetric.

water goat by wuad June 1, 2013

Speed Goat 

Slang name for the North American Pronghorn (Antilocapra americana). So named due to it's close resemblance to a goat and it's incredible speed.

While it's difficult to measure their speed, most sources state upwards of 70 Km/h, and they're known to be the second fastest land animal, second only to the cheetah, but able to sustain higher speeds for longer distances than the cheetah.

Oh, Crap! We're going to hit that speed goat. Duck! Why do they hang out near the highway?

I've given up hunting speed goats because they taste like a cross between a Slim Jim and sagebrush.

Speed Goat by Sigmo January 2, 2011

ginger mountain goat

A ginger, but with the appearance of a mountain goat. Typically has side burns and does occasional hand flips which represents the awkward hooves of a mountain goat.

Look at the wild ginger mountain goat kids!

ginger mountain goat by WHATDIDIDO Smith November 11, 2011

Unicorn Bird Goat 

It's unicorn a bird and a goat
.
.
.
It's like a goat but magical with wings and a horn
It's really amazing honestly

person a: "What was that?"
person b: "It was a Unicorn Bird Goat!"

Unicorn Bird Goat by BingBong13 January 10, 2021

You've got a face that resembles the south end of a north bound goat 

You are ugly

You've got a face that resembles the south end of a north bound goat

You've got a face that resembles the south end of a north bound goat by Matthu Wyshart July 17, 2009