ˈbüˌbü noun
( -s )
Etymology: probably baby-talk alteration of boohoo
1. dialect : a usually minor physical injury (as a bruise or scratch) especially on a child
he fell down and he's got a boo-boo on his forehead
2. slang : a foolish or embarrassing error : a stupid or careless mistake : blunder , boner
committed a boo-boo at his press conference