One who engages in incestuous sex with their brother.
1963, Robert E. L. Masters, Patterns of Incest, p 269
3
A homosexual man.
Here in N tank was a pretty slim boy lover, the little brotherfucker telling tender tales of lusty sucking twelve-year boys, pants down on the sofa, […]
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Idioms & Phrases
Example Bank
3
01
This hurts like a brotherfucker!
Wiktionary
02
1963, Robert E. L. Masters, Patterns of Incest, p 269
Wiktionary
03
Here in N tank was a pretty slim boy lover, the little brotherfucker telling tender tales of lusty sucking twelve-year boys, pants down on the sofa, […]
Wiktionary
Usage Notes
i Register
In some senses, brotherfucker is marked as vulgar, literally. Watch for register when choosing this word.