someone who is fat You could do with a bit of exercise yourself, lard-arse!Your brother's a bit of a lard-arse, isn't he?
lard with
v.
1. To cover or coat something with lard or a similar fatty substance: The cook larded the rice with pork fat.
2. To enrich or embellish something thoroughly with extra material: The performer larded the monologue with boring stories. The report was larded with unnecessary quotations.