Why "brand" new?

[AlsoNamedBort]

As I was watching the Price is Right this morning, I realized that I really didn’t know what “brand new” means. I mean, I know it’s used to say basically “totally, completely new,” but I had no idea what the dictionary definition was.

So I looked up “brand” online:

–noun
1.
kind, grade, or make, as indicated by a stamp, trademark, or the like: the best brand of coffee.
2.
a mark made by burning or otherwise, to indicate kind, grade, make, ownership, etc.
3.
a mark formerly put upon criminals with a hot iron.
EXPAND
–verb (used with object)
9.
to label or mark with or as if with a brand.
10.
to mark with disgrace or infamy; stigmatize.
11.
to impress indelibly: The plane crash was branded on her mind.

None of those seem to describe “new.” So what’s the deal?

[conway]

Cecil’s answer

[MikeF]

And why (and what) would it be spanking?

[Moonlitherial]

@MikeF

And why (and what) would it be spanking?

Same link!