KSI

A raper who is very successful and make YouTube video and is a professional Boxer

Hay that is KSI from YouTube

by Tux_YT December 10, 2019

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ksi

ksi is a fatneek

by rowleymc March 10, 2022

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An adult baby who is still crying over DanTDM’s tweet

“You know KSI?”

“Ohhh the British guy?”

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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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A Amazing Person With a Good sense Of Humor Who Wants to Inspire People with his Facal Expressions and That Laugh of his

by KsiFan👊 July 22, 2020

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KSI is a clan in Halo

KSI now means Knowledge, Strength and Integrity

Make up your mind JJ

“Yo Fitz lets play Halo, I heard KSI is giving some rewards!”

by Holy!oly August 12, 2019

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by Huffy I’ll June 12, 2022

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