sibling fucker

noun2

1. •
   (vulgar, offensive) One who engages in incestuous sex with their sibling.

   • It seems that only half of all Americans are brain damaged sibling fuckers — 2006
2. •
   (vulgar, offensive) A motherfucker (a generic term of abuse).

   • Has nothing to do with bandwith, you sibling fucker. — 2001