KSI

KSI is our beautiful fatneek. He has more tits than your mum, and he beat logan paul

KSI is also ALLOW IT MAN

by kim tyung November 22, 2021

KSI

An Egotistical knobhead

“Oi that KSI is such a cunt Yano”

by kenningtonbaby November 30, 2024

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

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

Knowledge strength integrity fat neek big forehead a man of many personality’s ksimon sidemen

Ksi is our fat neek

by Pengest of the pengest November 14, 2021

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

KSI stands for Knowledge, strength, integrity

KSI is a lad / top shagger

by j.d_joe November 13, 2019