KSI

Ksi-noun(Kay-S-eye) The dark skined ,bandana wearing ,5'11 feet Youtuber who will beat Jake Paul silly this coming year.
Ksi-verb(Kay-S-eye)To beat a person like the Youtuber KSI beats bearus

Yesterday a Ksi (noun) pulled a Ksi(verb) on someone who tried to attack him.

by The one who shall not pass July 27, 2020

ksi

fatneek

ksi is a fatneek

by lightblazing December 19, 2020

ksi

a guy with the thiccest forehead. Also he's a fatneek

ksi is an ksi

by Sahan__ October 10, 2020

Ksi

A fat neek

You heard of that UK ksi he a pissboi

by Nigeriaboi123 September 9, 2020

KSI

Short form for 'kiss simone immediately'.

Has a 12 inch d*ck. Overall a sexy beast.
And the goat youtube boxer. And a damn good rapper.

Heyy look who's here 'ksi' omg he's the best.
I wish i could learn boxing from him!

by Dammmmmnboi November 25, 2021

KSI

If you know a KSI then they would most likely ruin your family at christmas and never get invited to a roast ever again.

My friend KSI fucked his mum at christmas and was never invited back home.

by dead boyyyyyy May 21, 2020

KSI

Ksi is a black dirty nigger who has a brother that made a Diss track on him including all his 'nemesis' which is better than any other song he has made in his entire music career

Ksi is a dirty nigger who has no taste in music.

by Ksithenigger November 14, 2019