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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
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Jan 18 Word of the Day
1. Blue Monday is the most depressing day of the year, calculated by Dr. Cliff Arnall, a researcher at the University of Cardiff's Center for Lifelong Learning.
Factors used to calculate the date included weather conditions, debt level, time since Christmas, time since failing our New Year's resolutions, low motivation and feeling the need to take action.

In 2005 the date was calculated as January 24th, in 2006 it was January 23rd, and in 2007 it was January 22nd.

2. A song by the hard rock band Orgy from their album Candy Ass.
1. Guy: "Aw man, I feel like absolute shit today."
Friend: "Yeah, same here. I hate Blue Monday."

2. "I wish I could sing Blue Monday to my ex-girlfriend, she's such a bitch."
by L_Roku August 31, 2007
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3
95% of the people that don't live in a city
Not all truck drivers are sister fuckers but all sister fuckers are truck drivers
by treeman7 May 24, 2018
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4
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
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5
DuDE: look its a fucking sister fucker lets beat him up
Man: YEEEEEEAAAAAH
by some_boi_xxxxx December 20, 2018
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6
1) A guy who fucked your sister.
2) A guy with a hard on for black girls, usually not a black guy.
3) A guy who would rape his own blood.
1) Your little sister was in the Guinness Book of World Records as the Best Fuck in Baghdad three consecutive years in a row in the 2000s, then that sisterfucker Benny got with her.
2) Kevin sure does have a hard on for black chicks, he wants to become a sisterfucker.
3) Jorge and his homeboys ran a train on his big sister again, he's a sisterfucker piece of shit!
by Solid Mantis September 18, 2018
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