KSI

mans has the hugest forehead on planet earth and laughs like the biggest idiot on earth.

Guy 1 :Hey man did you see KSI's new video

Guy 2 : Yeah, love his videos but man his foreheads huge.

by samtheman12369 October 24, 2020

Ksi

it stands for knowledge Strength Iceland

John: im ksi
his dealer:Okay

by Yinkas grandma June 9, 2020

KSI

Big Black Youtuber who beat Logan Paul and has a big forehead

Hey do you think KSI has a big forehead.

by Ur Step Dad's Brother January 20, 2020

KSI

The champ who will be known forever in history for his fantastic rematch against the fucking prick logan paul

i love KSI

by Fuck logan and jake paul November 13, 2019

KSI

KSI (Kissing Sphincters Indiscriminately) are a community of anilingus enthusiasts on XBox Live.

John: Dude, why does the mic on this headset smell like ass?
Jeff: Oh, I joined KSI the other week and they made me sell my toothbrush.

by Big Jez October 17, 2013

ksi

A nigga with a carrot penis who defeated logan paul in a boxing match

oh he has a carrot penis, he must be ksi

by DarkAegis January 5, 2020

KSI

Someone who is not what they are or Fatneek
KSI stands for Kiss Simon Immediately

Your are a KSI because you were a Fatneek

by Neutralice March 13, 2022