What you say when you are in a group of 2 or more people and someone else asks for a volunteer to do something lame. The last person to say it is stuck with the task/ duty/ whatever.

Bob and his brother Joe are hanging out. Mom walks into the room...

Mom: "Boys, I need someone to pick up the dogshit."
Bob: "123 not it!"
Joe: "Aw fuck."
by mellowcheddar June 03, 2007
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Simple, often secret, way of saying I Love You over text or chat, without being too forward
Goodnight! 123!
by *Sparkle*123 August 18, 2010
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1 love 2 hearts 3 words.
Girl: Do you like me?
Boy: No. I <123 you.
by baddozer[; June 06, 2007
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used in web forums to denote a quote that they entirely agree with 100%. the term "you took the words right of my mouth" comes to mind.

however, because they forums disable spaming by requiring people to type at least 3 characters per post... 123 comes to mind
bob: anarchy sucks

jim : "bob : anarchy sucks"
by jaredong May 19, 2005
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The first 3 numbers you learned this in kindergarten I hope you looked this up as a joke
Teacher: ok please count for me

Student: 123

Teacher: good job billy
by Pe pe123 September 27, 2019
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