also BIGSEY, BIGSY
1. having an exaggerated sense of one's own importance; arrogant, pretentious, conceited, proud ...1881 Sc. colloq.
2. rather large ...Bk1898 Sc.
from big (adj.) + Scots -sie, a suffix forming adjectives with the sense ‘somewhat, rather’
FIRST DOCUMENTED USE
1881 - see EXAMPLE below
"...There is a story told of a certain tailor known in his then immediate neighbourhood as a ‘gey bigsie kin' o' bodie’..."
From: The Aberdeen Weekly Journal