We found one dictionary that defines the word deffos:

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1. deffos: Wiktionary

Definitions from Wiktionary (deffos) ▸ adverb:  (colloquial, chiefly UK) Definitely. ▸ Words similar to deffos ▸ Usage examples for deffos ▸ Idioms related to deffos ▸ Wikipedia articles (New!) ▸ Words that often appear near deffos ▸ Rhymes of deffos ▸ Invented words related to deffos