One of the mysteries of the English language finally explained.
nounUnited States Regional, Southern
A blue-bellied person, one regarded as low, contemptible, or cowardly; specifically (a) a northerner; (b) a northern soldier, especially during the American Civil War (1861–5).
Early 19th century; earliest use found in John Pickering (1777–1846). From blue + belly, after blue-bellied.
blue belly/ˈbluː ˌbɛlɪ/
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