Generally, meat gets stringier, gamier, and less tasty as the animal ages: compare mutton (an old sheep) to lamb.
also gamy, 1844, "spirited, plucky," from game (n.) + -y (2). Meaning "tasting or smelling strongly" is from 1863.
Daring; racy; slightly risque´: shown in its gamy uncut version
[1843+; based on the taste and odor of game that has slightly decayed]