Someone who is talked up by everyone as a person who is awesome, but actually sucks in reality. They are not actually a man of honor, they are actually a piece of shit. When someone says that someone else is a great man, they don't actually mean that they are a great person, it is meant as a sarcastic term.

Also, when someone is constantly a "great man", you can award them the "great man award". This is given to them for simply being a great man!

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.