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