fire-hot
/ˈfʌɪəˌhɒt/adjective
1Very hot, red-hot.
2 Figurative. Inflamed with zeal, passion, or lust; ardent, fervent.
3Of food: having a taste characterized by an intense burning sensation; very spicy.
Origin
Old English; earliest use found in Cynewulf (fl. c975), poet. From fire + hot.