It means that he has an odd rooting in what he thinks comprises manly behavior. Namely, he thinks that all of his actions can be explained because he is off wang. Be leary of anybody, male or female, who likes to explain their actions away because of their gender.

For one, it means they actually think thats a viable excuse, and for b, they're probably not prone to change much, one way or another, because of the first one.

While I do think that many of life's little nuance has its rooting in our gender, I do think that the vast majority of things have nothing to do with our our wangs or vags. I had a chick tell me once that she was difficult because she was a girl. I quickly gave her the old heave (a) ho because if she thinks its okay to be difficult because she's a girl, well, that relationship was going to go down in flames anyway.

Plus, do you know how many things you can technically get away with if, "I am a man after all" is a legit excuse? Allow me to provide some:

-socks on the floor
-sleeping with another woman while in a relationship
-not listening
-playing video games all day
-not changing diapers
not watching chick flicks

The list is really endless.

So anyway, you should probably check him on that next time and ask him what that means and if he really thinks some things just are as they are because he's a man. And what all does his list of "man things" entail. It might save you some trouble down the road if he's as ridiculous as he has the potential to be.