ETYMOLOGY
from chatter + mag (a chatterbox)
EXAMPLE
“…Now then, stop that; we don’t want no such dal’d nonsense; we come here to work. Now then, you women, divide into twos, and begin at both ends, or we shan’t get any work done for your chattermagging…”
From: Stubble Farm;
Or, Three Generations of English Farmers
By Hubert A. Simmons, Vol. II, 1880
Chapter I. P. 14
Lexicophilia 