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A very close friend that you trust
J1 is my Killy you know, known man from young still
Killy by Ggfb June 21, 2020
Yes Killy

My Killy

Killy McGee

"Try telling that to Killy McGee up there."

Kill Off Killy 

Kill off Killy is an old Jamaican saying, meaning if someone takes the piss with you they need to get hurt.
Kill Off Killy by HBEATz November 13, 2016
Killy is someone who you are close to and someone you trust

It is British slang used mostly is south london.
Speaker1: s1 is my guyyyyy
Speaker2:yeah man he is my killy still

Speaker1: yeahhh
Killy by U scrummed it June 30, 2022
Noun. Killy is a shortened and more hip version of “killer.” Here, killer is used to refer to your badass friend.
Eg 1. What’s up my killy?

Eg 2. Conzi: yo bro

Donk: Yh my killy
Killy by ConziIsUnBelievable November 8, 2021