The story
From a conflation of mis- + guggle (“to soil, dirty”) and mis- + Scots gruggle (“to disorder, rumple”).
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: To spoil by rough or careless handling; handle roughly; rumple; crumple; maul; mangle or disfigure; mar; spoil; bungle. Full definition →
From a conflation of mis- + guggle (“to soil, dirty”) and mis- + Scots gruggle (“to disorder, rumple”).
Etymology from Wiktionary, CC BY-SA 4.0.