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If it's yellow, let it mellow. If it's brown, flush it down

A phrase used to determine the appropriate circumstances under which to flush a toilet. Urine was to be left unflushed in the toilet bowl while feces were to be flushed right after bowel evacuation. This was used in efforts of water conservation either in the sense of environmental conservation or the saving of clean toilet tank water during power outages in remote areas.
Man, don’t waste three gallons of water to get rid of a cup of sterile piss.”
“Why is that kindly hippy?”
“Just remember man, 'If it’s yellow, let it mellow. If it’s brown flush it down.'”
“Thank you, sir. Perhaps with the water we save in the crapper you might be able to bathe more thoroughly in the future.”

If it's yellow, let it mellow. If it's brown, flush it down

Labatt Yellow 

The result of drinking vast amounts of Labatt Blue
I got bombed off Labatt Blue; a couple cigarettes and a little while later, it became Labatt Yellow and spewed forth from my piehole.
Labatt Yellow by C-Mills July 25, 2007

Sun Yellow

The best colour ever, don't even try me.
"What colour you want your jumper?"
"Sun yellow, I'm not a pussy"
Sun Yellow by Big Rick Astley Daddy December 12, 2016

My yellow 

A person who make you happy and make your day 100% better
She/he is my yellow
My yellow by anonymous November 3, 2020

black and yellow

Pittsburgh....Wiz Khalifa's hood...home of the black and yellow teams, including the Steelers, Pirates, and Penguins.
Snoop has the LBC...Wiz has black and yellow

The yellow from the egg 

A german idiom translated to english, indicating that they can't speak english well.
My english is not the the yellow from the egg, but it goes