Samuel L. Jackson did the first few days of the campaign for Capital One Bank's new credit card by saying that it offers 1 1/2% cash back "every damn day." They then changed it so later commercials said "every single day."
A radio commercial for Samuel Adams beer back in the 90s had the founder of the company saying that the difference in carbs between a regular and a lite beernote This was before Sam Adams made a lite beer is about "three tortilla chips worth. BFD." Though it's really only an example of this trope to people who realize that BFD stands for "Big Fucking Deal."
One of the adverts for the Prime Computer featuring the Fourth Doctor and Romana has the Doctor quietly saying "Damn" when the offscreen alien knows that he owns one of them.