There's a name for everything.

The dot on an "i" is called a tittle.
The white curve at the end of the fingernail (emphasized by a french manicure) is called a lunule.
Man boobs are called gynecomastia.
A useless feature on a thing is called a skeuomorph.
Paresthesia is pins and needles feeling.
Those spots of colors you see when you rub your eyes are called phosphenes.
An armscye is an armhole in a shirt.
A stomach rumble is called a wamble.
A peen is the side opposite the striking side of a hammer.
Rectal tenesmus is the feeling of incomplete defecation.
Misheard lyrics are caled mondegreen.
Petrichor is the smell of freshly fallen rain.
A purlicue is the space between the index finger and thumb.

Info from here. There's a few more at the link.