Pull the plug

[E_Rossetti]

The nation's largest cigarette maker, Altria Group Inc.'s Philip
Morris USA, has failed in yet another attempt to sell Americans
on a potentially safer cigarette, pulling the plug on Marlboro
Ultra Smooth, a version of Marlboro that used a high-technology
filter.

What does Pullig the Plug means???

I am brazilian, my english is poor, but I want to learn more and more! Is it meaning that the Marlboro Ultra Smooth brand is to be discontinued?

[Lost_Soul]

When you pull the plug, you cut off electricity supply to the electrical appliance by removing its plug from the wall socket.
I guess you can guess what "pull the plug on something" means idiomatically.
Also, you can refer to this explanation: http://www.thefreedictionary.com/pull+the+plug

[Prezbucky]

"Having so effectively answered the question, lost_soul has all but pulled the plug on this thread."

(an example of how one might use that phrase in everyday speech)
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Billie Jean is not my lover. Hee.