RhymeZone: frou-frou definitions

Definitions of frou-frou:

noun: (onomatopoeia) A rustling sound, particularly the rustling of a large silk dress.
adjective: Liable to create the sound of rustling cloth, similar to 19th-century dresses.
adjective: Highly ornamented, overly elaborate; excessively girly.
adjective: (derogatory) Unimportant, silly, useless.
verb: (rare) To move with the sound of rustling dresses.

(Definitions from Wiktionary)