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<p>Oh, my little internet noobies ;D
Before there were forums such as these, there was the Usenet groups. Today they can be found as Google Groups. Instead of each topic (e.g., college searching) having its own site, there was a central place on the internet (even before the world wide web was a concept and there was no internet browswers) that you could go to discuss various topics. Those abbreviations were used back then (you can see them back as far as 2000 if you search but I am sure they go back even farther, but maybe google only took over the groups then.)</p>
<p>It means Dear (Dangity, Darn) Daughter or Son.</p>