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
by 1982 steve March 12, 2017
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
person 2- yeah he was a real killer-boss
by Llamadabomb January 09, 2022