To have drank so much/become so intoxicated that you pass out.
Michael drank a good night; he went down and didn't come up for the rest of the night!
by c4rol September 15, 2011
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Often uttered on Fark.com, Slashdot, and other comment-enabled news sites whenever a celebrity, more often than not a comedian, passes on.
by Dodger of Zion April 4, 2006
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An expression of surprise, shock, or exclamation can be shortened to just "good night!"

A southern expression.

Synonyms: wow dang
"Good night a livin she finally found it!"

"Boy is it stinky in here! Good night!"
by Liquid metal March 26, 2016
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A one night stand.

The act of hooking up with someone with no intention of having an on-going relationship.
Sarah: Did you go home with that guy from the bar last night?

Kate: Yup. Nothing like a good night's sleep.
by RedBeard53 July 11, 2011
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sometimes just referred to as "good night" to signify the use of any alcoholic substance as a "sleeping pill".
He stays awake if he doesn't drink his good night (beer).
by Jon July 4, 2004
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The odd phenomenon of your hair looking its very best just before you go to bed. Cousin to "oh no haircut hair," the even odder phenomenon of your hair looking absolutely perfect on the very morning of a haircut appointment.
He stumbled into the bathroom at midnight only to discover, as usual, that he had Good Night Hair.
by Xmarcus May 1, 2009
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