ETYMOLOGY
apparently from pan- (all) + guts (the belly, stomach)
EXAMPLE
“…”Odzbodkins! You won’t spoil our sport,’ cried her husband. “Your crotchets are always coming in like a fox into a hen-roost.”
“I have work in hand that must be done,” replied his wife.
“Panguts!” she exclaimed, raising her voice and her fist at the same time, “what do you do? lazying about here like a mud-turtle nine days after it’s killed…”
From: Margaret: A Tale of the Real and Ideal, Blight and Bloom
By Sylvester Judd, 1845
Lexicophilia 