A long time, usually defining how late
someone might stay up at night or out at bars, nightclubs, discos etc.

The origin of the phrase goes back to
a time when people were familiar with the time cows came home
(in the very early morning... 4 - 5 a.m.) because they wanted to be milked.
Person 1: We are going to go out to night!

Person 2: Really? how long?

Person 1: We are staying out until the cows come home!
by G. Canis March 23, 2004
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1) For a very long time.
2) From now until whatever time the fat broads you live with return to the house.
1)
When the cops started knocking on the door of the cocaine storehouse, Pete and Tony jumped out the window and ran until the cows came home.

2)
"Hey dad, when are we gonna be eating dinner?"
"Not until the cows come home, son. Where the hell are your mother and sister? I'm hungry too."
by Nick D February 25, 2004
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after or for a very long time
He'll be making bad choices until the cows come home if you don't advise him on how to do this.
by The Return of Light Joker December 28, 2010
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cows have no time,Cows leisurely graze in the grass and move about as they feel.meaning till the cows come home.
What time are you coming home.Till the cows come home. (you have no specific time,you will come home at anytime)
by Mr T 1000 April 15, 2014
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Standing there alone, the ship is waiting
All systems are go, are you sure?
Control is not convinced
But the computer has the evidence
No need to abort
The countdown starts
Watching in a trance, the crew is certain
Nothing left to chance, all is working
Trying to relax, up in the capsule
"Send me up a drink", jokes Major Tom
The count goes on
Four, three, two, one
Earth below us
Drifting, falling
Floating, weightless
Calling, calling home
Second stage is cut, we're now in orbit
Stabilizers up, running perfect
Starting to collect requested data
"What will it effect, when all is done?"
Thinks Major Tom
Back at ground control there is a problem
Go to rockets full, not responding
"Hello Major Tom, are you receiving?
Turn the thrusters on, we're standing by"
There's no reply
Four, three, two, one
Earth below us
Drifting, falling
Floating, weightless
Calling, calling home
Across the stratosphere
A final message, "Give my wife my love"
Then nothing more
Far beneath the ship, the world is mourning
They don't realize, he's alive
No one understands but Major Tom sees
Now the light commands, this is my home
I'm coming home
Earth below us
Drifting, falling
Floating, weightless
Coming home
Earth below us
Drifting, falling
Floating, weightless
Coming home
Earth below us
Drifting, falling
Floating, weightless
Coming, coming home
Home
Home
Home
Home
Home
Home
Home
Home

Major Tom (Coming Home)
by Death Menace June 19, 2023
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at some unspecified time in the future, perhaps never.
Raymond will repay all the money he owes. That will probably happen when the cows come home.
by Geraldinexxx January 11, 2012
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