ignoratio elenchied

(/ˌɪɡ.nəˈɹeɪ.ʃiˌoʊ ɪˈlɛŋ.kaɪd/)

adj.

Drunk to the point where every explanation of the journey home addresses a different problem.

Brick became ignoratio elenchied while explaining the taxi fare to someone asking for directions.

Source: Wiktionary