We found one dictionary that defines the word fluff one's feathers:

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1. fluff one's feathers: Wiktionary

Definitions from Wiktionary (fluff one's feathers) ▸ verb:  To show off. ▸ Words similar to fluff one's feathers ▸ Usage examples for fluff one's feathers ▸ Idioms related to fluff one's feathers ▸ Wikipedia articles (New!) ▸ Words that often appear near fluff one's feathers ▸ Rhymes of fluff one's feathers ▸ Invented words related to fluff one's feathers