When a woman has hard nipples, it usually takes place in cold office buildings. It refers to the thermometer that pops up when your turkey is done cooking
"Hey girl, your turkey's done."
by Little Miss Muffintop July 28, 2006
An expression to point out that a female in the room has erect nipples. Typically used for a woman with particularly large nipples like those of a temperature indicator on a turkey in the oven that pops up when the bird is done.
by Jeb from NH July 25, 2003