Green’s Dictionary of Slang

(US campus) a stereotypical sorority member; also attrib.

1974		Eble Campus Sl. Oct. 4: Suzy-sorority – [...] All the girls at the party had that Suzy-sorority look.
1974		Pittsburgh Press (PA) 18 July 14/1: Hey there, Miss Suzi Sorority...and I’m talking to you too, Fraternity Fred.
1978		Eble Campus Sl. Apr. 4: suzie – a girl who is blatantly sorority orientated in her dress, mannerisms, etc.
1980		Eble Campus Sl. Spring 5: susie, suzi – a sorority member.
1989		P. Munro Sl. U. 185: Suzy Sorority someone who belongs to a sorority.
1996		Eble Sl. and Sociability 65: She tries to be cool, but she’s just a Suzi-poser.