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Japanese for flat. Can be used to say a girl has small boobs.
Gura is not boing boing, so she is hydrodynamic and also pettan. Ame however, has two big floaties to help her swim, so she is not pettan.
Pettan by Wordbert December 6, 2020
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Unlike boing boing, Pettan means somebody who has small and flat breasts. Also heavily jokes and popularised by Hololive and some VTuber who have a flat chest get made fun of.
Marine: HAHAHAHAHA, RUSHIA IS SO PETTAN!!
Rushia:*sucker punches* ORRAAAAAAAAAAA!!!!!!!
Pekora: HA↗️HA↘️HA↗️HA↘️HA↗️HA↘️HA↗️HA↘️HA↗️
Pettan by Reinbokuru April 16, 2024

Pentanium 

A derivative of the 'Pentium' processor used by non-tech saavy consumers when looking for this type of processor.
"Excuse me, do you have any Pentanium processors? You see my hard drive in my modem caught on fire and I need to replace my Pentanium."
Pentanium by Kevlar D November 10, 2007
Made up by George Ezra, meaning cool, awesome, amazing, or anything you want it to mean
That song is so petan!! Keep your peckers up!
petan by trutru2 April 5, 2015
In anime and manga, a flat-chested girl who is obsessive and/or insecure about this fact.
"You're into that anime girl? What are you, a lolicon?"
"She's not a loli, she's just a pettanko."
pettanko by theflying_clubcup January 24, 2009

madonna puttana 

Madonna Puttana is an useful italian expression.
It may assume several meaning depending on the situation.
The origin of the exclamation come from the beginning of times, where Madonna got pregnant by the Mule and not from Giuseppe, her husband, who was the first to say 'Madonna Puttana'

moeghea madonna puttana !
Please shut up!

ehh madonna puttana !
What have you done?

Varda madonna puttana !
I did know it! It happened.

ehh Madonna (stra)puttana dio can!
We have (serious) trouble.

Chi xe sta? A madonna puttana ?
Who did it? It wasn't you, was you?
madonna puttana by CCqq January 17, 2009