The story
From earlier East Anglian dialectal dallop (“patch, tuft (of grass, etc.)”), of unknown origin. Compare dialectal Norwegian dolp (“lump”).
First known use, by meaning
- from 1810s A considerable lump, scoop, or quantity of something, especially soft food.
- from 1820s To apply haphazardly in generous lumps or scoops.
Etymology from Wiktionary, CC BY-SA 4.0.