[FuzzieAlum]

I've never heard of Post Office, but here's a few more:

Ceiling: The maximum number of women a chapter can have, although it can go over this number by taking in up to quota in a formal rush pledge class.

COB (Continuous Open Bidding), aka Informal: A (more or less) unstructured rush held at any time other than during formal rush by sororities that are not at ceiling and would like to pledge more women.

No-frills: Formal rush system where costumes, elaborate foods, skits, etc. are forbidden at all or most rounds.

Cut: When a sorority either does not invite a woman back to further parties, or the rushee does not go back to a house she was invited to.

Legacy: Definitions vary slightly depending on the sorority, but generally a mother, daughter, neice, grand-daughter, step-whatever, etc. of an initiated sister/alumna. Sorority rules sometimes dictate she cannot be cut from the first round of parties; if she is cut, national HQ will generally inform the family member.

Oh yeah, and NPC has officially ended the use of the term Rho Chi, but you know it's not going to disappear anytime soon!