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The act of taking a #1 out of where you normally take a #2. It's a nice way of saying you have liquid diarrhea.
I ate some undercooked chicken yesterday and have been on the toilet twelving all day.
Twelving by Markatak November 28, 2016
The act of faking being high. Pretending and acting like you're high when you really aren't.
Yo Josh is so stoned right now!
Nah dude he only took one hit he's twelving.
To stand a motorcycle or other vehicle straight up in the air, front over back.
In motorcycle stunting, pulling a wheelie so high that the bike rests on the it's tail section is called a "twelve o'clock". The act thereof is called "twelving".
Twelving by ThrustinJ August 12, 2007
To 'space out'. Specifically the special sort of mental sluggishness brought on by watching television or any similar mental haze.
1: "Which street do we turn onto?"
2: "Huh? Oh, sorry. I don't know. I must have been twelving."
twelving by Ninniane McFey October 12, 2005
The act of taking a solid 12 minutes alone and masturbating online.
E: Hey mate
E: you still here frend?
E: ..you been gone solid 12 minute, mate. You masturbating?

R: YES FREND I GOD DAMN TWELVING ALMOST DONE.
twelving by kuack January 15, 2013
When you're with your group of friends and they all start cornering you by being annoying, twelving is the perfect word to use.

It was a play on words to mean annoying. Since 'twelve' in Korean is shipi (십이) and 'annoying' is shibi (시비), it was a clever way to combine the two for a whole new word. (Credits to Koreaboo)

Made by Kim Mingyu of SEVENTEEN !!
B: you're late again lol
C: i bet you spent all night playing games again
D: didn't redacted broke up with you becau--

A: why are you guys twelving already?
twelving by 17deul January 5, 2022