Whatever bodily liquid you wake up in from the night before.
Person 1.I must have had a really awsomr dream last night my bed was soaked when I woke up.

Person 2.Dude! Tmi I don't need to know how your morning water came about!
by Conker1 October 5, 2016
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that glorious first piss of the morning.
Edvard likes to start his out his day with a nice steaming mug of his own morning water.
by Dickie Moist October 8, 2003
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NOTICE: This word has an abbreviation. It is Mater pronounced Mah-ter, it rhymes with water. Now for the definition.
The shit you drink when you first wake up because your throat is dry as a bone. Morning water tastes like uh-oh stinky 97% of the time. If it tastes good, consider yourself very lucky. Night water is better.
James: Dude that mater tasted actually good this morning.

Sammy: Bruh, can I have some of it!?!??
James: Nien. Go gitcher own morning water biiiiiitttcchhh!
by Snoobab March 27, 2020
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When you wake up and your stomach rumbles and you have diarrhoea that comes out as golden liquid.
"My diet results in morning water everyday"
by Ekker October 19, 2022
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