noun
two holes
Literal meaning: two holes or openings. Can refer to any object with two perforations.
この部品には二穴が必要です。
This part requires two holes.
noun
toilet with separate chambers for urine and feces
Refers to an old-style squat toilet or outhouse with two separate openings. Rare in modern contexts.
昔の便所には二穴のものがあった。
In the past, there were toilets with two separate holes.
noun
riding double (on a bicycle, motorcycle, etc.)
Slang term for two people riding on a single bicycle or motorcycle. Usually written in katakana as ニケツ.
See also: ニケツ
ニケツは危ないからやめよう。
Riding double is dangerous, so let's not do it.