noun, noun or participle which takes 'suru'
farting while asleep
Slang term for passing gas during sleep. Often used humorously or in casual conversation.
昨日、寝ナラしちゃったみたい。
I think I farted in my sleep yesterday.
彼はよく寝ナラをするらしい。
Apparently he often farts while asleep.
Compound of 寝 (ne, 'sleep') and ナラ (nara), an abbreviation of おなら (onara, 'fart'). The exact derivation is uncertain, but it is a modern slang coinage.