Kookster 

Someone who can be regarded as eccentric, crazy, or otherwise senile. Generally used in reference to an older person.

That old guy at the store is a total Kookster.

Kookster by Schwag December 16, 2013

kookster 

another term for a kook

That poser is a total kookster.
Dude, your a total kookster

kookster by clowner April 22, 2007

Koogster 

The “Koogster” or for short “The Koogs” is a elite Bad ass that can kill 11 bears with one finger and will be the person who is going to probably take over the world some day, but in a good way.

I wish I was the Koogster, but god only blessed us with one.(cry’s)

Koogster by Mr. Koogs July 8, 2018

kwokster 

Kwokster is a fifa n00b with a small d****. However, Kwokster is a nice fella overall.

That guy is a real Kwokster - but I love him.

kwokster by mgmtcon90 May 2, 2018

koosteria 

someone who writes and makes her readers wanna bang their heads on the wall and cry

"OH IT'S KOOSTERIA AGAIN, SHE'S BACK TO MAKE US CRY!"

"FUCK, WHERE DO YOU EVEN GET THESE IDEAS FROM???"

koosteria by bitchnaneunsolo July 19, 2021

koosteria 

she also writes fluffs, mind you.

"koosteria if you keep writing domestic fluffs how am i going to survive being single???"

koosteria by jeonjeongguks November 23, 2021