yes, yes it does..
you see he is breast feeding from his mother and thus he prefers boobs instead of a bottle..
since he's a boy = man
In western culture there are terms that some men self describe themselves based on the physical attributes of the female anatomy that they find attractive. An example would be a "leg man" a person that prefers a beautiful leg of a woman, or a "butt man" a person that prefers a nice rear end of a woman.
A "boob man" is a person that prefers a woman's breasts, since he is breast feeding, that's why his shirt says "boob man" it's kind of a play on words..
Hope that clears things up..