The Collaborative International Dictionary of English v.0.48:
Beefy \Beef"y\, a. Having much beef; of the nature of beef; resembling beef; fleshy. [1913 Webster]WordNet (r) 3.0 (2006):
beefy adj 1: muscular and heavily built; "a beefy wrestler"; "had a tall burly frame"; "clothing sizes for husky boys"; "a strapping boy of eighteen"; "`buirdly' is a Scottish term" [syn: beefy, burly, husky, strapping, buirdly]