from The American Heritage® Dictionary of the English Language, 4th Edition
- interj. Used as a mild or ironic oath: "Gadzooks! Is there a panic detector, akin to a smoke detector, that sniffs anxiety in the air?” ( George F. Will).
from Wiktionary, Creative Commons Attribution/Share-Alike License
- interj. An expression of surprise, shock etc.
Perhaps alteration of God's hooks, the nails of the crucifixion of Christ.(American Heritage® Dictionary of the English Language, Fourth Edition)
Contraction of God’s hooks, with reference to the nails of the crucifixion of Jesus. (Wiktionary)