User blog comment:ChishioKunrin/I showed my dad RWBY/@comment-25555436-20150926133944/@comment-4010415-20150927033433

Real manboobs are when the pecks are enlarged because of fat.

They're called pecks because the muscles in your chest are called the "pectoralis" muscles. Even if you're not super muscular, you have pecks. Some men do work out enough to enlarge their pecks to where they look similar to breasts, but they're enlarged because of muscle, not fat.