Consisting of, characteristic of, or suitable for boys or young men; assertively masculine in character; (also) youthfully boisterous.

Ostentatiously or notably manly or virile; assertively masculine or tough; producing an impression of manliness or toughness.

a man characterized by (esp. exaggeratedly) assertive masculinity; (without article) this type of man.

Relating to or characteristic of a stud (stud, n.2 7a); attractively muscular or masculine. Also in extended use: powerful; impressive.