- (US, slang) Something very good of its kind.
- 1904: Saturday night we had our final parade with the fireworks finish, and it was a lallapalootza! — Hugh McHugh, I'm from Missouri, 1904. Quoted in Susie Dent, Larpers and Shroomers: the Language Report, Oxford University Press, 2004, ISBN 0-19-861012-2, page 16.
Origin unknown. Probably a fanciful formation.