Fatty Koo 

a girls big butt (the group fatty koo defined it as such)

Damn, she gott a fatty koo!

Fatty Koo by Jasmine K. September 29, 2005

WAh-PI-Ser-TI-NEE-koo 

This word is used to make awkward moments less awkward.

What!?! WAh-PI-Ser-TI-NEE-koo?

WAh-PI-Ser-TI-NEE-koo by Massicotte February 9, 2008

ya koo 

he will suck anyone and take it in the ass for a free cat

ya koo sucked me for some dinner

ya koo by poqwehfpwhefipuh October 24, 2018

Erin Koo 

The mindset of searching for cute seniors

I HAD A FEELING OF AN ERIN KOO YESTERDAY WHEN I WAS DRUNK.

Erin Koo by jchoi0121 March 17, 2020

Tiny Koo 

'Tiny Koo', is a nickname given to BTS' youngest member; Jeon Jungkook.
Especially used during the moment when he looks small/tiny in size.

For ex., when he wears oversized clothes.

Tiny koo is my eternal religion.

Tiny Koo by Zephyr_ January 6, 2021

silky.koo 

silky.koo is a very talented tiktoker on her way to fame she’s the number one fan of y.j_txt

silky.koo is a smexy bug

silky.koo by SeggcySoobinStan January 29, 2021

Emily Koo 

The worst professor that doesn't actually teach/lecture and believes the reason we are failing is not at all her fault.

Student 1: Bro, how was Emily Koo last semester?

Student 2: Emily Koo was the worst, I hate her, I literally don't know why they haven't fired her yet.

Emily Koo by fed_up_college_student February 13, 2023