a farewell expression used by the ladies of Theta Phi Alpha. Can be used as a farewell in person or in letters.
It's meaning is kept close to heart.

Yitbos (sometimes YITBOS):

a. a word used by members of the Delta Sigma Phi fraternity as a general salutation. Its actual meaning is kept under tight wraps by the fraternity, and a favorite hazing ritual of initiation is to have pledges come up with definitions/acronyms for it.

b. something men of a certain upbringing and moral fortitude say to one another in order to make themselves feel important