Wichita Falls police Sgt. Harold McClure says the woman picked up the cake at the store's bakery last Tuesday and ate half of it before getting to the checkout counter. He says a manager called police after the woman claimed she had found the cake that way and would not pay full price for it.
Officers ordered her to pay the full price but did not issue her a citation. She was banned from the store and her name wasn't released.
In January, another woman was banned from a different Walmart store in Wichita Falls after she spent several hours driving an electric shopping cart around the parking lot while drinking wine from a Pringles can.
The city is about 125 miles northwest of Dallas, near the Oklahoma border.