Dummy: (Noun) A very stupid person.

Oh, if you were wondering, Jessica Simpson is still a big dumb stupidhead. In today's thrilling adventure, Jessica Simpson tries to buy Adidas merchandise in a Nike store. Doh de doh!

"Jessica asked the sales associate helping her where the Adidas sweat pants were," a witness says. Probably at the Adidas store!

"The guy thought she was joking," adds the witness. Nope — the singer just didn't realize that Niketown sells only Nike apparel. Oops! (Source)

Something similar to that happened to me once like six or seven years ago when I asked my ex-boyfriend to go through the Burger King drive-thru to get me a Mandarin Chicken Salad. As in, the ones they sold at Wendy's. (Side note: Do they still have those things? They were awesome!) At any rate, oddly enough, he didn't have the greatest sense of humor about that. But still, while that was dumb of me, the only way it could have been "Jessica Simpson dumb" is if I would have asked him to get me a Big Mac with a side of Nachos Bell Grande.