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This charming phrase first gained usage in the early 80’s and is still widely used today in the advertising industry. It is a useful phrase to be aware of, in that it serves as a reminder of the level of contempt in which that industry holds its intended targets.

It refers specifically to that type of television commercial where two women are seen in a domestic setting "naturalistically" discussing the relative merits of products, thus:

Woman A : How do you get your whites looking so white and smelling so fresh?
Woman B : I use Super-Fresh Whiter-Than-White! Now with added freshness!
Woman A : I think it’s time I switched to Super-Fresh Whiter-Than-White!!
(Both women smile. Cue jingle.)

In case you haven’t already guessed, "2 c's in a k" stands for "two cunts in a kitchen".