"You canker blossom!" 3 Shakespearean Insults
c.1600, perhaps from Dirk, the proper name, which was used in Scandinavian for "a picklock." But the earliest spellings were dork, durk (Johnson, 1755, seems to be responsible for the modern spelling), and the earliest association is with Highlanders, however there seems to be no such word in Gaelic, where the proper name is biodag. Another candidate is German dolch "dagger."