I'm sarcastic and kind of a smart ass. I like a good argument and holding ridiculous conversations with a straight face. I'll be polite, amiable and inquisitive when I first meet someone, but I'll gradually move toward a mixture of gratuitous profanity and GRE words as I figure out your sense of humor and boundaries.
I value physical fitness and intellectual curiosity equally, and believe that both are important indicators of a person's character (barring, obviously, external circumstance outside one's control).
I believe the basis of a good relationship is a combination of physical attraction, a good sense of humor and the ability to make fun of each other and yourself. A little competition makes things fun too.