'boo-boo' definitions:

Definition of 'boo-boo'

From: GCIDE

boo-boo \boo-boo\ n.
1. an embarrassing mistake.
Syn: blunder, blooper, bungle, foul-up, flub, botch, boner, misdoing. [WordNet 1.5]
2. a minor injury, such as an abrasion on the skin; -- child's talk. [PJC]