Dictionary.com
Thesaurus.com

hadaway

British  
/ ˌhædəˈweɪ /
  1. dialect an exclamation urging the hearer to refrain from delay in the execution of a task

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of hadaway

perhaps from hold 1 + away