Anything pertaining to ladies. Lady things can range from tea parties to bodily functions. Generally a sore topic amongst men (in fact, you'll probably never hear a man refer to a lady thing as a "lady thing.")

When you eat dirt for the first time and leave your family to build a shack in the woods

An affectionate or comical term referring to a female friend.

Someone who appears to be a man but is in fact a woman. This person is not neccessarily a tranny.