Definitions for gadzooksˌgædˈzuks
Random House Webster's College Dictionary
(used as a mild oath.)
Origin of Gadzooks:
1645–55; perh. repr. God's hooks (i.e., the nails of Christ's Cross)
An expression of surprise, shock etc.
Origin: Contraction of God’s hooks, with reference to the nails of the crucifixion of Jesus.