What do they mean by 'your carpet match your drapes' on the Samantha Who? preview??

just curious they dont say!

Yep Drapes/Curtain represents hair on your head.

Carpet/Rug - hair in your special little area...

In other words, is your hair dyed? Is that your natural hair color on your head?

And you can tell merely if the person is lying, if these both don't match! Or so they say... ;-)

Hair in the pubic region the same color as the hair on the head.

I've heard that expression used like Chad describes above.

I agree with chad and not jessica. Jessica's definition may be the PG-13 version.
More commonly, it is "your carpet match your curtains".

I've herd that b4. It means that the hair on your head is the same colour as your hair...well...elsewhere.

if the hair on your head match's the hair between your legs

it means that your bra needs to match your panties