The area between your legs. Your crotch.

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

The area under the sachel of a male reproductive organs.

another name for a womans ass

Very simple. This is your pet's fucking stomach.

If you are a little pudgy, your gut may sag down when doing push ups or copulating. This can be particularly unattractive as during vigorous sex, it may swing from side to side, back and forth, much like a metronome. In extreme cases, the folds of fat, or female breasts, may slap together making a sound not dissimilar to the sound of a sealion performing for food at shows at many zoos. This noise is known as flap or tat slapping.