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
Short cut definition for a one-on-one meeting between an employee and their boss. Commonly used in the subject line of an email or meeting request. Not intended as a formal meeting to review one's performance evaluation, this meeting is often only 30 minutes and is conducted weekly or every other week.
I had my 1:1 with Kevin last night down on the first floor conference room.
by AndrewMcL June 18, 2009
Binary notation for rating the attractiveness of a female human. 0 is no, 1 is yes. First number indicates willingness to perform oral sex in front, the second number oral sex in back.

Technical details are beyond the scope of this paper.

PDG
"Damn, Minka Kelly is hot, definitely 1:1."
by PDGZ November 10, 2020
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
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
Something that you out at the end of your sentence to be sarcastic
Nice shoes!1!1!1!1!
by ilovemarcushxoxo December 2, 2016
!1!1!1!1 is often used to make someone hate you as it is very cringey
“ u guys are so nice !1!1!1!1 “
Katie is amazing !1!1!1!1
by KPhatr June 3, 2018