ETYMOLOGY
from cugger (to hold a confidential conversation)
EXAMPLE
“…There was a great laugh at Tim’s answer; and then there was a whispering, and a great cugger mugger and coshering; and at last a pretty little bit of a voice said, “Shut your eyes, and you’ll see, Tim…”
From: Fairy Legends and Traditions of the South of Ireland.
By Thomas Crofton Croker, 1859
Treasure Legends. Dreaming Tim Jarvis
Lexicophilia 