fustilugs

Fus·ti·lugs n.

[Fusty + lug something heavy, to be drawn or carried.]
A gross, fat, unwieldy person. [Obs.] F. Junius.

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(FUS-ti-lugs)

noun
A fat and slovenly person.

Etymology
From Middle English fusty (smelly, moldy) + lug (to carry something heavy).

Usage
"'Come on, you old fustilugs,' he called, for she wheezed and blew and mounted with difficulty." — Julian Rathbone; Joseph; Little Brown; 2001.

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a ponderous clumsy person, esp. a fat and slovenly woman