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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
by Capt. Chunkstyle June 5, 2006
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Mellow with the Yellow

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Some who enjoys being urinated on
She was mellow with the yellow and got R.Kelly'd
by PapíKwondo June 27, 2016
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mello yellow

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It shrinks the size of ur dick. Same with Mountain Dew.
Matt drinks alot of mello yellow so his dick shrunk.
by cartman5000 July 25, 2004
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mello yello

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The nectar of the Gods. Smoother than the Mt. Dew, better tasting than Vault. It has just the right amount of caffine, and it will make your penis bigger.
Girlfriend: WOW! Your penis looks bigger!
You: You bet! I've been drinking Mello Yello!
by Hodgii November 18, 2007
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mello yello pizza

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the best type of pizza; while the idea is still only theoretical, it is scientifically conjectured that manufacture and sale of mello yello pizza would triple any pizza businesses sales within a month
while the chemistry students scoffed at the idea of mello yello pizza, the chemistry teacher praised and supported it.
by Jeremy Longshanks November 4, 2007
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Mello Yello

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A asian that smokes alot of weed. Therefore does not give a single fuck.

It is recommended that you do not cheat off them on test, because they do not study as much as there hard working counterparts.
Kevin: Hey look at all those asians smoking weed behind the bleachers.

Jim: what a bunch of mello yello's.
by jackie wang November 19, 2012
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