from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Informal Images, especially photographs, of minimally attired men with muscular physiques.
- n. Informal Attractive men with muscular physiques, such as those in these images.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Used other than as an idiom: see beef, cake.
- n. Imagery of one or more muscular, well-built men.
- n. Such a male, especially as seen as physically desirable.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a photograph of a muscular man in minimal attire
beef + (cheese)cake.(American Heritage® Dictionary of the English Language, Fourth Edition)
From beef + cake, by analogy with cheesecake ("an image of a sexy young woman"). (Wiktionary)