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2.
One who makes friends with a guy only to get close to his (usually younger) hot sister.
I thought Kevin was my friend... But it turned out he just wanted my sister. What a shameless sister fucker!
by Urban_Fellow June 23, 2006
 
1.
someone from Alabama
get off your your brother you sister fucker
by tony's big bologna September 17, 2005
 
3.
Implies that some one fucks there sister. TO be used in a very derogatory tone. The implication of incest is not acceptable in any culture. It is a very popular saying in India, and will usually result in huge fight when muttered.
Yo Sister Fucker you messed up today's order!
Tobus is such a Sister Fucker!
by Lanus69 April 27, 2012