killer-boss 

An idiot that thinks he/her is better at a competition/game but is really just bad and gets defensive about it.

person 1- woah, you see that dude. he challenged us to a 1v1 and I barely lost any hp.
person 2- yeah he was a real killer-boss

killer-boss by Llamadabomb January 8, 2022

boss killer

Boss killer is a man with a huge ego that is never wrong subsequently drives everyone around him crazy .lack of human intelligence, needs lessons on communication, needs to pull what ever is up his bit out.boss killer

That boss killer is driving me insane

boss killer by 1982 steve March 11, 2017

killerb0ssy

An amazing person who loves to tell people to go work out! Very beautiful and perfect 🤩

Killerb0ssy: you’re a fat fuck
James: Thank you very much

Killerb0ssy: go work out
Kevin: okay I will!

killerb0ssy by Iwillmurdereveryoneyoulove June 2, 2021

killerboss 

Another word meaning really gd

Naar ,that was killerboss

killerboss by Nathan September 22, 2003

Killerbassy 

FTW runescape player. he owns all of you.

player1: hey is that killerbassy?? player2: yeah wow I wanna borrow his items!

Killerbassy by Killerbassy January 29, 2009