I think I first encountered it on Slashdot a decade or more ago, but I've rarely seen it outside of Slashdot or, more recently, HN, so I think it's a Slashdottism that migrated to HN with Slashdot users.
Though I could be wrong, as my exposure to internet message boards is weirdly eclectic, but far from comprehensive.
Though I could be wrong, as my exposure to internet message boards is weirdly eclectic, but far from comprehensive.