noun
queef; vaginal fart
Vulgar slang term for a vaginal fart; used in very informal, often crude contexts.
彼女がヨガのポーズをとったら、膣ナラが出ちゃった。
When she did a yoga pose, a queef slipped out.
Compound of 膣 (chi, 'vagina') and なら (nara), a slang term for farting sound, from the onomatopoeic ならす (narasu, 'to make a sound'). The exact derivation is uncertain, but it is a modern slang coinage.