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2.
Group of male fraternity members. usually low in intelligence and devoid of culture, academia, or common sense. topics of conversation include sports, beer, girls, alcohol, partying, beer, and bad action movies. members almost always dress the same, talk the same, and go to the same places together.
Drew: "Bro. check out my new Polo."

Mark: "So when did you join the Frat Pack? Gay."
by LarsLevinstein October 20, 2008
 
1.
Comedy troupe made up of Ben Stiller, Luke and Owen Wilson, Vince Vaughan, Jack Black, and Will Ferrell. Responsible for some of the "classic" comedies of the late 1990s and early 2000s.
-"Hey, did you see Wedding Crashers yet?"
-"Yeah, it didn't really compare to Anchorman but the frat pack still came through with another good flick."
by Baba Ganoosh July 17, 2005