noun
last bath; bath taken after everyone else
Refers to the last bath of the household, taken after other family members have finished. Often implies the water is cooler or less fresh. Contrasts with 一番風呂 (first bath).
See also: 一番風呂
今日は遅く帰ったので、仕舞風呂になってしまった。
I came home late today, so I ended up taking the last bath.
仕舞風呂はぬるいことが多い。
The last bath is often lukewarm.
一番風呂 means the first bath, taken while the water is fresh and hot, whereas 仕舞風呂 is the last bath, often cooler.
Compound of 仕舞 (しまい, 'end, finish') and 風呂 (ふろ, 'bath'). The reading しまいぶろ follows standard rendaku voicing.