むんむん
mummun

Suru Verb
To-Adverb

1. stuffy; steamy; sultry

Onomatopoeia
その部屋 へや参加 さんか しゃ熱気 ねっきでムンムンしていた。
sono heyawa sankashano nekkide mummun shite ita.
The air in that room was thick with the enthusiasm of the participants.
Other forms: