i-adjective
male-smelling; smelling like a man
Describes a strong, often musky or sweaty odor characteristic of men. Can be used literally or figuratively.
部屋が雄臭い。
The room smells like a man.
彼のTシャツは雄臭かった。
His T-shirt smelled male.
Similar meaning, but 男臭い can also imply a rough, masculine character, while 雄臭い focuses more on the physical odor.
Compound of 雄 (osu, 'male') + 臭い (kusai, 'smelly'). The exact origin is uncertain, but it likely emerged as a colloquial expression.