Noah Webster's Dictionary (p. pr. & vb. n.) of Wag.

Multi-Version Concordance Wagging (2 Occurrences) Matthew 27:39 Those who passed by blasphemed him, wagging their heads, (WEB KJV ASV WBS YLT NAS RSV) Mark 15:29 Those who passed by blasphemed him, wagging their heads, and saying, "Ha! You who destroy the temple, and build it in three days, (WEB KJV ASV WBS NAS RSV)