The disporportionately large pectoral muscles that a
man develops when he spends too
much time at the gym working his mirror muscles. Often accentuated by
waxing.
A: Do you think that
guy's
hot?
B: What? No! Look at those man tits. He needs to get a life and spend less time at the gym.
Personal trainer: So what can I do for you?
Customer: I want to get in shape, but I
don't want man tits or anything.