Mama, just killed a man, put a gun against his head
Pulled my trigger, now he's dead

from Queen – Bohemian Rhapsody Lyrics on Rap Genius

Meaning

This part is obvious. He committed murder. I don’t he’s confessing to his mother here, as surely she would already know by the time of the execution. I think that he’s really just sadly reflecting on what he’s done, and he mentions this to his mother (or perhaps he’s just thinking about her)

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