figurative (mostly humorous or slang). Applied to persons having the characteristics of a colt. A lively or spirited person.

colloquial. Chiefly in plural. A lively person.

In various slang or colloquial senses. U.S. ‘A dashing, riotous fellow’ (Bartlett).

Denoting a person or thing (with varying degrees of contempt or admiration). With modifying adjective (in playful reproof, congratulation, or…