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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.
by Markatak November 28, 2016
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Twelvie bitch

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A twelvie bitch is an eleven year old girl who is pretending to be a twelvie, when she isn't even on that level yet, unlike the people the grade above her. She will have Instagram which she will update regularly with selfies of her and her BFFL. She has one or two baes and will beg her parents to drop her at the mall, only to take lots of selfies with her baes and tag them in the photo. Expect, even in the middle of winter, to have slutty lace tops and miniskirts, and don't forget the make-up! She will often comment on her friends profiles with a '😍 so pretty bae'. Comes in the form of Ashleys, Georgias, Lanas and Halles.
Stupid twelvie bitch
Look at all the twelvie bitches
by doctorpotter July 3, 2014
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Twelvie Baggage

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When a celebrities fan base is comprised of so many young girls that it is off putting.
I would be a fan of One Direction, but they have too much twelvie baggage.
by CameronBatman October 11, 2013
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Tweleb

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A Twitter Celebrity. (Someone who has a great following on Twitter)
Upblissed is my favorite tweleb, he posts the best tweets.
by H0ldenlol January 24, 2023
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A person that is of the age 12. They think they're top sh*t. They think they own the place. They think they can win fights. They think they can do whatever they want. They act like there 16.
Wow that kid is such a twelvie.
by Sarcasmm Queen April 7, 2015
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twelvish

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at or around twelve

e.g. 11:50, 12:10
tip: also look -> noonish
-"What time is it?"
-"Twelvish"
-"Thanks"
by pseudonim_artystyczny October 5, 2007
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Twelvehitphobia

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a fear of 12 am KST thinking that bighit will drop something
I hace twelvehitphobia because bighit might drop something
by yoongiscutiee October 20, 2020
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