a blustering braggart who pretends to prowess; a swaggering boaster ...1771
from the the name of Bobadil, a boastful character in Ben Jonson's Every Man in his Humor
FIRST DOCUMENTED USE
1771 - see EXAMPLE below
"...Stay, stay, my good Bobadil, I have not done with you yet; let me just hint to you, that you have no more title to sense and understanding, than you have to real spirit and courage..."
From: Newmarket: Or, An Essay on the Turf: Containing, Amongst Other Grave and Weighty Matters, a Parallel ... between Newmarket Races, and the Olympic Games...
By Philip Parsons