1 definition by Oh Donna

Top Definition
A woman who is officially affiliated with a fraternity. Little Sisters are usually given the fraternity's letters to wear after a sort of initiation, but they don't undergo a Pledge period and have limited rights and privileges within the frat. They are not considered to have equal standing with the Brothers and don't participate in rituals or attend meetings.Usually long time friends of the guys in the frat and/or the serious girlfriend of a Brother, a Little Sisters provide support to the fraternity. They assist in Rush events, bake cookies, and generally make the guys look good.
After two years of baking brownies and cleaning up after the guys Kari was made a Little Sister of the fraternity.
by Oh Donna May 21, 2008

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