The story
From swamp + -y. Compare Saterland Frisian sumpich (“swampy”), Dutch sompig, zompig (“swampy, soggy”), German sumpfig (“swampy”), Swedish sumpig (“swampy”).
Etymology from Wiktionary, CC BY-SA 4.0.
swampy
Today it means: Soggy and marshy; wet like a swamp. Full definition →