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

The story:

My dad and I thought it was the narrator's mother
who killed a man, thinking the man was the
narrator's abusive father. I now have since
realized that it was the narrator himself who
killed a man, which was likely not his father. I
don't know what my dad thinks now; he was never
really that into Queen. But it is confusing since
the original lyric is like a run-on sentence. Yet
not all lyrics make any sense at all...