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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.
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