Top Definition
1. a female who likes to engage in the ancient art of fisting with other women.

2. the act of fisting your female sibling.

3. an order of nuns devoted to fisting

1. watch out for that chick, i hear she's a fister sister

2. A: i often like to fister sister
B: you mean, fist a sister?
A: same thing dickhead

3. she is a sister of the fister religion.
by 60 2nd squire January 05, 2009

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