boo-boo
NounWordNet 3.0
Webster's Dictionary (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]