I don't think I've heard that expression. Although I think that'd be a hell of a compliment, considering the average brick measures around 8" x 3 5/8" x 2 3/16 " (not that I went outside just now and measured a brick). So a brick of that size would have a volume of 63.4375 cubic inches. To put that into cock terms, that would constitute a cock of over 12.75 x 7.75 (or some other equivalent combination).
So yes, I never heard that expression before, but some day maybe I will be worthy of the compliment.