Lumpy

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Middle English: perhaps from a Germanic base meaning ‘shapeless piece’; compare with Danish lump ‘lump’, Norwegian and Swedish dialect lump ‘block, log’, and Dutch lomp ‘rag’.

wiktionary

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lump +‎  -y

etymonline

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lumpy (adj.)

1707, "abounding in lumps," from lump (n.) + -y (2). In early 19c. slang, "drunk." Among sailors, of the sea when forming small waves in rough water, from 1857. Related: Lumpiness.