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Something or someone who makes you weak, even if you are a very strong person
I'm a very strong person but you make me weak, you are my kryptonite.
by SydneySilver April 23, 2016
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Aug 8 Word of the Day
A method of guessing on a multiple choice test that involves looking at the position of the second hand. If the hand is between 12 and 3 the guess is A. If the hand is between 3 and 6 the guess is B. Between 6 and 9 guess C. Between 9 and 12 guess D.
I passed my test! Thanks to the Clock Method
by ET4444 November 12, 2007
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Related to the Superman movies: Superman's weakness.The only thing that can hurt the man of steel.

My definition:

A man/woman that calls someone their Kryptonite means that they are their weakness. Someone or something they have to stay away from because they want it even though it's not good for them or will hurt them.

Someone you want but can't have can be called your Kryptonite.
-You like Jane?

-Yeah dude but I gotta stay away from her because she's got a boyfriend. She's my Kryptonite.

-I'm allergic to shrimp.It's my Kryptonite.

-You're like Kryptonite to me. I have to stay away from you.
by GuestStar December 09, 2009
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Intellectually powerful enough and attractive enough to seduce the strongest willed Playas, Pimps, Macks,Daddies,Hubbies, and Champions.
Man she's got that Kryptonite!

Aww man I swear this Man has got some Kryptonite!
by Buttafly G. September 29, 2010
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5
Kryptonite is a compound consisting of the element krypton, according to chemical-forming "-ite" nomenclature of chemistry.
However, krypton is a planet where Superman Clark Kent comes from and the substance kryptonite from it due to the explosion is fatal to our Superman, i.e. the translucently green rocks you would see in the TV series and which make Clark Kent dizzy and feeble and can even kill him.
Thus figuratively, it means something that makes you weak, powerless and limp, i.e. your weakness, whenever it comes to you, because it can even weaken Superman, let alone you!
Just as the song "Kryptonite" in the Australian Idol Guy Sebastian's album where the lyrics go:
Cos I can't stop thinking of you
I'll be trying not to love you
I'm helpless, girl it's true
So I'm giving up tonight
Cos baby you're my "kryptonite"

***That girl's exactly Guy Sebastian's "kryptonite"!!
by estherteng April 10, 2007
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1.Tight mutha fuckin song by Purple All-Stars

2.Sum Strong Bud
"I Be On That Kryptonite, Straight Up On That Kryptonite"
by OutKasted October 27, 2005
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