kryptonite

1. The only substance that can harm wordSuperman.
2. (metaphorical) Something you have a strong aversion to.

1. Kryptonite is Lex Luther's only defense.
2. No mayonaise please; that shit is kryptonite to me.

by zachwolff October 20, 2003

kryptonite

(n.) a form of crystal methamphetamine that turns into a green liquid when melted for the purpose of the inhallation of its vapors.

Man this ice is kryptonite, this shit is crazy.

by clownpenis January 6, 2006

kryptonite

Anything that's "poison" to you, something that's so horrible you'll always want to stay away from it.

Sandra loves music by Philip Glass, but she can't stand anything by John Adams. She thinks that John Adams' stuff is musical kryptonite.

by pentozali March 3, 2008

kryptonite

(noun)
1: A green, radioactive metorite, broken from the distant, late planet of Krypton, that cancels out any Kryptonian's superpowers, such as Superman.
2: Something that is a great weakness to a particular person, such as the aforementioned metiorite to Superman, etc.

1: Krypto the Superdog (of the said show): Kryptonite... my one weakness...
2: Galatea (Justice League Unlimited): Boredom is my kryptonite... well, kryptonite is my kryptonite, but you get the idea.

by DanMat6288 August 3, 2005

kryptonite

Best type of weed in the world please believe it

That kryptonite kept me indoors last night

by HintonSparks October 15, 2006

kryptonite

It's a weakness. The one thing that can hurt you like a achilles' heel

Tequila is my kryptonite.

by Rockydog August 23, 2017

kryptonite

When something is delicious but really really bad for you but you cant help wanting it anyway.

Craig Skinner is my kryptonite.

by weelaurabee September 4, 2017