Check out Wordspy's list of the 100 most interesting new words and phrases.
E.g.: retrosexual: someone (usually a man) who spends as little effort as possible on his appearance
male answer syndrome: the tendency of men to answer a question whether or not they know anything about the answer
bigorexia: feeling that one's muscles are inadequate when they are already excessive
man cave: where the man of the house retreats to when stressed, usually storing his power tools...