KSI or JJ Olatunji is a black British internet star and musician who is part of a group called the Sidemen.

He is also a fatneek and Babatunde would kick the shit out of him in a fight.
KSI is a fatneek
by NInJaButInCAPS April 12, 2021
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a black nigger coon who's ancestors used to work for the Belgians in the Congo to harvest rubber until they moved to the soon to be state of Niggeria.
KSI sucks dick for $1.25 to make money & Miniminter made him.
by KSI's biggest fan April 24, 2019
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a legend that fought Logan Paul and joe Weller and won both fights, soon a fight against Jake Paul.
He is a musician, a boxer and, a YouTube star.
KSI is part of the sidemen and he makes songs and, is a boxer.
by SHIBOO55 December 6, 2020
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Nothing screams integrity more than slapping your mom at Christmas also KSI is black
by Big_titty_nigger November 26, 2019
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KSI is an acronym for a gaming community/organization that is over 10,000 members strong. KSI stands for Knowledge Strength Integrity AND Killing Services
Incorporated. Members from this clan have gone to MLG events, and KSI has their own professional players. A common misconception is that: "If you are in KSI, you have to be good at that game." This statement is incorrect by all means. KSI has clans that welcome all gamers aged 16. and older. KSI does have pro clans in fact that you DO have to be good at to join. KSI, as a community discourages and despises cheating in any way. KSI is also a professional organization, made up of its members. KSI keeps clans well kept, and organized. KSI has a ranking structure, a uniform policy, and a GamerTag change policy to reach leadership ranks in the ranking structure. KSI, overall is a good gaming community/organization that enjoys interacting with eachother, and having fun.
1) That guy we met in matchmaking last night was in KSI.
2) That KSI guy is pretty good.
by KSI Kill Sins 7 November 6, 2007
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