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Twelvie:

Usually used for emphasis or in the jockular context. A large penis, ie a twelver. Can also be used to say you totally crushed a task, ie " our team won the football game by 38 points, fuc&ing TWELVED these bitches." Ie- as to say a brutal reaming with a large phallic object. "La Verga" , mast like.
P1: "Why don't you STFU and sit down before your sorry".

P2: " Your the one that will be saying "Sally" when I make you suck my big Fn Twelvie. "
( Fight Ensues)
Twelvie by Lexicon Steel February 28, 2024
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Twelvie bitch 

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

Twelvie Baggage 

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.
Twelvie Baggage by CameronBatman October 11, 2013

twelvie slut 

Twelvie slut:
A person beetween the ages of 12-15 that cakes on makeup, sleeps around, sens nudes, is a total love slut, fakest bitch out. Biggest, attention seeker you will ever meet, and the type of person, who posts all their gifts and ritches all over social media, they think they're hawt, walk around acting like they were born perfect, horniest skaniest, bitch ever.
Person 1: dude, portias a total twelvie slut.
Person 2 : yeah, she's so fake brah.
Person 1: she's so much trouble.
twelvie slut by 0805xx May 11, 2014

Twelvie Season 

School Holiday, vacation, when all the high school students go on break from school.

When all the Twelvies are out of school.
Friend 1: Ugh, there's so many people in the shops today.
Friend 2: Yeah, its Twelvie Season
Twelvie Season by Squisheee October 26, 2014

twelvie relationship 

a twelvie relationship is a relationship where the people in the relationship do simple cringy things that every first couple does for e.g. hold hands, sit next to each other. To the point where it is just awkward and just stupid cringy!
Billy and Samantha are in such a twelvie relationship
twelvie relationship by GayFag23 November 13, 2018

superseded twelvie 

Anyone 16 years or older that acts the same way as a twelve, like dresses slutty, pretends to do adult shit when she really doesn't do shit. Basically a twelvie that never got over themselves
Bro 1: Man she's soo hot, look at all of the shit she does! I wander what she's like in bed ;)
Bro 2: Bruh, she's just a superseded twelvie, she's an overgrown slutty twelve year old..
Bro 1: That's so shit man, hate them.