If you know a KSI then they would most likely ruin your family at christmas and never get invited to a roast ever again.
by dead boyyyyyy May 21, 2020

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.
Has a 12 inch d*ck. Overall a sexy beast.
And the goat youtube boxer. And a damn good rapper.
by Dammmmmnboi November 25, 2021

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

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.
its THE man the MYTH the LEGEND AKA Mr.Knowledge
sub to KSI and jj olatunji.
by NOAH1818 June 6, 2021

KSI is a fatneek
by KSI is a bosssssss April 19, 2020

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 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
by FUCK LOGAN PAUL October 10, 2019

by iminhellplshelpahhh September 26, 2024
