also BOOSTIS, BOISTOUS, BUSTHIOUS
thickset, corpulent, over-fat ...1854 Eng. dial. (Cornwall)
from boist (n.) corpulence, boist (adj.) fat, corpulent (Eng. dial.) + -ious
FIRST DOCUMENTED USE
1854 - as per The English Dialect Dictionary: 'Used at Polperro, N. & Q. (1854) 1st S. x. 179'
"...The Commodore was a little purgy, bustious sort o' man, sir, wi' a squinny eye an' mottles upon hes face pretty near so thick as the Milky Way..."
From: The Astonishing History of Troy Town
By: Arthur Quiller-Couch, 1888
• The English Dialect Dictionary, Joseph Wright, 1898-1905
• Glossary of Words in use in Cornwall,
Miss M.A. Courtney, Thomas Q. Couch, 1880
• Randigal Rhymes and A Glossary of Cornish Words,
Joseph Thomas, 1895