I believe so. According to Green’s Dictionary of Slang, it usually referred to an obese person (or group thereof), but being used to mean “beefy” doesn’t seem too far removed.
beef trust (n.) [ironic use of SE beef trust, a conglomerate of beef producers/processors; orig. late 19C carnival use, created by showman W.B. ‘Billy’ Watson (born Isaac Levy; 1852–1945), who thus named his sideshow of grotesquely overweight women, the term was later adopted in his burlesque to describe a chorus-line of notably large girls; Watson also created the chicken trust, composed thin and reportedly beautiful women]
(Aus./US) an obese person, a group of obese people
[with examples dated 1914-2002]
Surely beef trust in this context is how muscled the guy is, right?
I believe so. According to Green’s Dictionary of Slang, it usually referred to an obese person (or group thereof), but being used to mean “beefy” doesn’t seem too far removed.
beef trust (n.) [ironic use of SE beef trust, a conglomerate of beef producers/processors; orig. late 19C carnival use, created by showman W.B. ‘Billy’ Watson (born Isaac Levy; 1852–1945), who thus named his sideshow of grotesquely overweight women, the term was later adopted in his burlesque to describe a chorus-line of notably large girls; Watson also created the chicken trust, composed thin and reportedly beautiful women]