A fork of Rural Dictionary
Sisterfucker. S-I-S-D-U-uh....-D-E-uh...R...fucker. Sisterfucker. -Alabamian
A husband or boyfriend that has female best friend that he says "she is like a sister to me". When in reality, he is cheating and is actually fucking the female friend.
John-doe is a lying Sisterfucker.