Ob-: /ob/ Pref. Obligatory. A Piece Of {netiquette} Acknowledging That The Author Has Been Straying From The Newsgroup's Charter Topic.

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:Ob-: /ob/ pref. Obligatory. A piece of {netiquette}
acknowledging that the author has been straying from the
newsgroup's charter topic. For example, if a posting in alt.sex is
a response to a part of someone else's posting that has nothing
particularly to do with sex, the author may append `ObSex' (or
`Obsex') and toss off a question or vignette about some unusual
erotic act. It is considered a sign of great {winnitude} when
one's Obs are more interesting than other people's whole postings.
-- The AI Hackers Dictionary