Na-Na Na-Na Boo-Boo Meaning

(Canada, US, idiomatic, colloquial, childish, pejorative, taunt, often humorous) [c. mid 20th century?] A taunt or putdown, typically used to indicate that the speaker believes he or she has beaten the listener in a competition or is better in some other way or in a general sense; or an expression of satisfaction that the listener has received some supposedly deserved minor punishment or misfortune (that is to say, schadenfreude).

Example: 1992, Committee on Labor and Human Resources, United States Senate, One Hundred Second Congress, first session, Oversight on the status of special education in Iowa: hearing before the Subcommittee on Disability Policy of the Committee on Labor and Human Resources, United States Senate, One Hundred Second Congress, first session, examining the major issues facing students, parents, teachers, related ...[1], ISBN 0160446279, 9780160446276, page 82:
  ... is that the educators out there aren't aware of this, they don't know it or what?
Ms. Bolinger. It's like na na na na boo boo, make me do it.
[Laughter.] ...
1998, Aeschylus, David R. Slavitt and Palmar Bovie, editor, Aeschylus, 2: The Persians. Seven against Thebes. The Suppliants. Prometheus bound‎[2], ISBN 0812216717, 9780812216714, page 5:
  [Translator's note by David R. Slavitt] ...here is to make clear that this is a display of Schadenfreude, an elegant cocking of the snooks, a protracted "Na-na, na-na, boo-boo," a symphonic Bronx cheer!