猿さる股また

noun

undershorts; boxer shorts; briefs

Refers to men's underwear, especially loose-fitting undershorts like boxers. The term is somewhat dated; younger speakers may prefer トランクス or ボクサーパンツ.

• 祖そ父ふはいつも猿さる股またをはいている。

  My grandfather always wears undershorts.