Definition of ballet girl:
(n) :
Valspeak; the dialect of English stereotypically spoken by valley girls.
(n) :
(US, slang) A girl or young woman from the San Fernando Valley, especially when stereotyped as superficial and material.
(n) :
(by extension, often derogatory) Any girl perceived to act or speak like a stereotypical valley girl.
(n) :
Alternative letter-case form of valley girl. [(US, slang) A girl or young woman from the San Fernando Valley, especially when stereotyped as superficial and material.]