(Image Credit: ABC News)

The dinner bill for three friends at Chilly D's Restaurant stung, but it wasn't the price - printed on the top of the receipt were the words "Fat Girls".

"I got the bill, I was looking at bill [and] I was like, 'Why does this receipt say 'fat girls?'" customer Christine Duran said.

The friends had dined out at the Stockton, Calif., restaurant, which is a part of the Cameo Casino Restaurant, on Thursday. The bill lists charges for three tri-tips with fries and three sodas, for a total of $25.50. A bartender named Jeff had apparently typed in "Fat Girls" to keep track of their bill.

When Duran asked a manager for an explanation, he "had like a smirk on his face, like it was funny but trying not to laugh," she said.

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The dining experience went from bad to worse when the restaurant demanded they still pay the bill, offering them a 25 percent discount and then a 50 percent discount. They declined both offers.

In a Facebook message overnight, Maggie Lewis, the Cameo Club Casino owner, apologized and said the insulting treatment Duran and her friends had received is "intolerable in our establishment."

Jimmy Siemers, co-owner of Chilly D's, didn't work the night Duran and her friends received the offensive receipt, but he said he is trying to clean up the mess.

"I just want to tell them we're sincerely sorry and we'll do everything in our power to make sure this never happens to anyone again," he said.

It's certainly not the first time customers have been insulted on receipts.

In January, a Papa John's employee was fired after writing "Lady Chinky Eyes" on a receipt to identify an Asian customer.

A Maryland woman was insulted at a RadioShack in March when she purchased a cassette tape adapter and left with a receipt that read "ugly itch" from "tattoville," referring to the tattoos on her arm in memory of a child lost to SIDS and her deceased mother.

"Based on descriptions we've seen in the media, this incident obviously does not meet RadioShack's expectations for customer service," Eric Bruner, a spokesman for RadioShack told ABC News. "RadioShack responded immediately after seeing reports in the media, taking the strongest possible disciplinary actions." It is against company policy to discuss individual personnel matters but the company has taken the "strongest action available" in response to the issue, the spokesman said.