Nipdart

The tiny, black, flying insects, usually seen in outhouses, that nip at your nuts and dart up your ass.

Upon returning from the latrine, David exclaims, "I just swallowed a Nipdart and I know it just flew off a log in the outhouse!"

itchyassitis

The terrible itching and/or burning sensation between the cheeks of your ass from working in extreme heat, in wet clothes, or from not wiping your ass good enough. In other words, give it a second wipe.

It was so hot at work, I had itchyassitis all night and bumburn this morning!