To kill. Mainly archaic. Possibly an impressive feat of arms resulting in the death of the opponent.
Past tense is either "slew", or occasionally "slain".
"Slay him!"
He slew his opponent in a duel.
St George is famous for having slain a dragon.
by Charoi January 18, 2016

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Caitlyn
Caitlyn always slays
by spongebob1408 January 19, 2017

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Slay is when you insult someone, but not in an obvious way. When you think a person is annoying and you want to strangle them, but you don't want to go to jail, so you insult them secretly.
"I think this looks good on me"
"As good as you look without all of that makeup on."

"I can get your boyfriend if I want to!"
"Exactly like your mom could make your dad stay. Ups. Sorry."

People in the background: "Slay!"
by Steve5214 June 25, 2016

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Defeating your opponent brutally.
I have to slay grandpa.
by Lolomon February 17, 2017

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An interjection or verb.
To exhibit a skill (particularly relating to aesthetics) in such a fashion that it causes an observer to exclaim.
To destroy the haters by exhibiting extraordinary talent.
Commonly used with any variation of the similar word yasss
Lady Gaga: *takes a step*
Person 1: OMG GAGA YAAAAS SLAY GAGA FUCK IT UP
Person 2: YAS BITCH SLAY ME KWEEEEEN
via giphy
by chupachudelrey February 15, 2017

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To slay, slayin(g).
Slaying a dragon perhaps, or a horde of enemies.
An outfit, cannot be slaying so don't be a dumb fuck. A person cannot just be slaying, that isn't even correct in grammatical terms. Your outfit cannot be slaying either, what is your outfit slaying? Nothing, it's some fucking clothes you dicknoses.
George: I went off to SLAY a dragon last week.
George's wife: My outfit doesn't SLAY today because that makes no sense and I am not an arsehat
by ponceman125 October 13, 2015

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The verb to verbally annihilate a fucking bitch.
'Oh I'm going to slay this bitch right now!'
by Ecoyle33 October 07, 2015

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