We found one dictionary that defines the word bunk out:

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1. bunk out: Wiktionary

Definitions from Wiktionary (bunk out) ▸ verb:  (slang, Ireland) Synonym of bunk off ▸ Words similar to bunk out ▸ Usage examples for bunk out ▸ Idioms related to bunk out ▸ Wikipedia articles (New!) ▸ Words that often appear near bunk out ▸ Rhymes of bunk out ▸ Invented words related to bunk out