When you wake up in the morning and a used condom is hanging out of your ass, thus creating a tail.

A tapering ridge found on a spoon, running from the base of the handle to the midpoint on the back of the bowl. Serves as reinforcement and decoration. Spoons featured rat tails from c 1670-1720 and were made in silver and pewter.

The root thick and covered with soft curls; at the tip devoid of hair, or having the appearance of being clipped.

An expansion discontinuity in a sand casting, featured as a long, narrow, linear depression, resulting from sand expansion and minor buckling of the mold surface during filling of the mold.