"Amscray!" (4)
(Other definitions for scat that I've seen before include "Go away quickly" , "Wordless jazz singing" , "Buzz off" , "Shoo!" , "leave quickly" .)
(Other definitions for shoo that I've seen before include "Dismissive remark" , "Begone!" , "word of dismissal" , "Get away" , "Sling your hook!" .)