1. a wild, thoughtless person; a noisy, talkative person ...1699
2. (as JINGLEBRAINS) stupidity ...Bk1942 Amer. colloq.
from jingle (vb.) + brains
FIRST DOCUMENTED USE
1699 - Jingle-brains, a Maggot-pated Fellow
From: A New Dictionary of the Terms Ancient and Modern of the Canting Crew
"...Rite your hippistles and gospels! I a butturd my parsnips finely! Am I a to be hufft and snufft o' this here manner, by a sir jimmee jingle brains of my own feedin and breedin?...."
From: Anna St. Ives: A Novel
- Thomas Holcroft, 1792