beer muscles noun[plural only]2 •An aggressive attitude resulting from consumption of an alcoholic beverage.Many people, especially after a few beers, grow “beer muscles” and are ready to fight for any reason. — 1979 •(humorous) A protruding stomach, supposedly indicative of excessive consumption of beer.Grothers Gribble, Berger, Wolf, Shadwill and the writer are still nursing their “beer muscles.” I mean German goitres. — 1939
