A punctuation mark most commonly used to show extreme excitement and/or shock. Since in most keyboards holding down SHIFT and pressing "1" creates an exclamation point, "!!1!" is used to imply that the writer didn't check what they were doing or that they were in a rush.
EXAMPLE 1:
Person 1: Hey, little boy! You're mom's in the hospital. She asked me, a complete stranger, to come to your school while you were switching between classes and pick you up. So, wanna get in my car? I've got candy! Don't worry, I'm not a rapist!
Person 2: OMGWTFNO!!1!

EXAMPLE 2:
Person 1: I JUST WON THE LOTTERY!!1! ZOMG!!1!!!1!
Person 2: NO!!1! FECKING!!1! WAY3Z!!1!
Person 1: Y3S WAYZ!!1!!!1! I JUST WON THE LOTT3RY!!1!
Person 2: ZOMG3!!1! HOW MUCH?!?!1?1!?!
Person 1: A MILLION DOLLARZ4S!!1!
Person 2: OMG!!1! YOU COULD BUY, LIKE, SO MUCH SHAMPOO WITH THAT!!1!
Person 1: IKR!!1!
by some wackjob on his laptop April 26, 2011
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When you copy and paste "!1!1!1!1!1!1!1!1!1!1" and go too far.
Person 1: SO FUNNY!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1!1

Person 2: Did this guy get crazy with the paste button?
by coolmathgames.com January 1, 2018
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used at the end of an extremely sarastic statement
i absolutely love my life!1!1!1!1
im so pretty omg!1!1!1!1
by helpfulgal01 June 10, 2017
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Used to make a sarcastic statement even more exaggerated.
Jacob Sartorius is my one true love!1!1!1!
McDonalds is such a healthy place to eat!1!1!1!
by zai.g0ddess August 19, 2016
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Something that you out at the end of your sentence to be sarcastic
Nice shoes!1!1!1!1!
by ilovemarcushxoxo December 2, 2016
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A term used to describe counterfeit goods of extremely high quality, so much so that they look identical to the authentic product.

Commonly used on r/fashionreps and among other counterfeit clothing communities.
Wow, Aooko’s ‘Ray-Bans’ really are 1:1.

Just got some 1:1 Yeezy knock-offs from China.
by ultimateharibo June 3, 2018
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the repeated usage of 1!!11! indicates the sarcasm after a phrase, sentence, or word.
for example
-" i hate you for saying that!1!1!1"
-" i hate you for saying that!1!1!1"
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