Hard core exterior with sexy atributes, a kind of lumber jack appeal with scruffy hair.

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.

It's some one (most likely male) who is attractive, but not like a pretty boy is attractive. Most likely they have long(ish) hair and a some what scruffy appearance and rather built. they are really hot anyways, or just because of it.

Good lookin not pretty boy type