1. well, in good health and spirits; lively, cheerful;
often used with 'pretty' ...1730 Eng. dial. & sl.
2. conceited, foppish ...Bk1880 Eng. dial.
of unknown origin;
for (1.) possibly from 'bob' (adj. ? lively, nice), or from 'bob' (vb. to move up and down like a buoyant body in water, to bob up and down with energy and good humour)
FIRST DOCUMENTED USE
1730 - see EXAMPLE below
"...Arthur to Doll
Is grown bobbish and uxorious;
While both she and Huncamunca tipple, talking tawdry;
Even Mr. Sol,
So tifted out, so glorious,
Glitters like a beau in a new birth-day embroidery."
From: Tom Thumb
- Kane O' Hara