Definition & Meaning of "banjax"in English

What does "to banjax" mean in Irish slang?

The structure is a simple verb of uncertain origin, possibly from a combination of "bang" and "shatter" or from "banjax" as nonsense word, but firmly established in Hiberno-English. It is used in Ireland to mean to ruin, destroy, or severely damage something, whether physically, mechanically, or metaphorically. People typically say "I've banjaxed my phone" or "The car is completely banjaxed." The term originated in 20th century Irish slang, and remains common in everyday Irish speech across all ages and classes, often in humorous or emphatic contexts.