A misleading tag of a more prominent figure, website, or blog attached under the entry of an obscure blog - when there is zero mention of said prominent figure, site, or blog in the blog entry itself. Piggyback-tagging is done in a transparent effort to gather the former's web traffic - again, without the courtesy of discussing or linking the subject. Content is usually similar but not necessarily so. In fact, they can get pretty random.
1.) "Check it, Phil - this never-heard-of-it health food store blog piggyback-tags Whole Foods, Central Market, Sprouts, Trader Joe's, Macy's, McDonald's, Angelina Jolie, 'American Idol,' & Haiti among his tags for his latest blog entry. Wow, what a trailblazer!"

2.) "Hey, Lady Papa Georgio is trying to get a record deal, and is piggyback tagging Lady Gaga under her latest blog - even though there's no actual mention of her there."
"Papa-who?"
"Exactly."
by SugarFreeSheila.com February 6, 2010
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