When you dip your dick in caramel and your girlfriend gives you head.
After the picking her up at the bar, we stopped by the CVS where she picked up a Twix bar, which of course I didn't think anything of, until we got back to her place and we were doing our thing, and she broke it over my dick and dripped the caramel onto the shaft and then sucked it and when she was finished she told me, "that what's called a 'Copper Throat," and then I knew true love.