Is Killer Queen a requiem?

Excuse me, I've been hearing a lot about this song called 'Killer Queen' and I'm curious, is it considered a requiem? I'm asking because I've heard that requiems are typically associated with mourning or memorializing the deceased, and the title 'Killer Queen' sounds quite the opposite. Could you clarify for me if there's any connection between the song and the concept of a requiem, or if it's simply a case of a misleading title?