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

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Get the KSImug.

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

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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

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KSI

If you came here to find the defenition of KSI then you're oficially stupid.
its THE man the MYTH the LEGEND AKA Mr.Knowledge
sub to KSI and jj olatunji.

KSI beat the living bluetooth 4k fridge out of Jake Paul

by NOAH1818 June 6, 2021

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KSI

They guy who beat Logan Paul in a split decision

KSI is a fatneek

by KSI is a bosssssss April 19, 2020

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KSI

Ksi means Knoledge, Strengh and Interity

ksi also is a youtuber that challenged logan paul to a boxing match, drew and is going to knock him out on november 9th
his also a nigger

KSI is a guy who will fuck the paul up

by FUCK LOGAN PAUL October 10, 2019

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