We found one dictionary that defines the word red-assed:

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1. red-assed: Wiktionary

Definitions from Wiktionary (red-assed) ▸ adjective:  (US, slang) Very angry; furious. ▸ Words similar to red-assed ▸ Usage examples for red-assed ▸ Idioms related to red-assed ▸ Wikipedia articles (New!) ▸ Popular nouns described by red-assed ▸ Words that often appear near red-assed ▸ Rhymes of red-assed ▸ Invented words related to red-assed