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.

In My Humble (Honest) Opinion, as in "Speaking IMHO" - A disclaimer of sorts, used on blogs, message boards, forums etc.; used to clarify that the statement being made should not be quoted as a fact, but only as an opinion.

Supposedly "in my humble opinion", this is always said before someone makes an asshole comment that is not at all humble. Much like "no offense" precedes an offensive comment.

In my humble opinion.

In my holy/honest/humble opinion.

A rephrasing of imo.

Used in net-speak (read: retarded), it's mainly used to attempt to show that the opinion stated was either godly, true, or was stated by someone with humility. All three of those reasons are what would be simply known as bullshit.

"In My Honest Opinion"