Not found in dictionaries. However, breaking down ‘bigothero’ into components: ‘big’ (BIɡ) and ‘other’ (ˈɒðər), ‘hero’ (ˈhɪərəu).

Definitions

1. noun

A person who is perceived as a hero, particularly in an unconventional or unexpected context.

“The firefighter was hailed as a bigothero for risking his life to save the family trapped in the burning building.”