Navel piercing and belly button piercing are essentially the same thing, although some contend that a "true" navel piercing is actually done in the remaining stump portion of the navel itself, casually referred to as the "outie".
Piercing an outie is thought to be more dangerous, as some believe this offers a direct route for infection to travel to the internal organs.
She possessed an "outie" navel that looked like a cherry tomato had dropped down her too-tight tee shirt and landed on the top of the hill.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.