Childhood nickname Jason Stiles has for Lorelai Gilmore on the Popular TV Show "Gilmore Girls"

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

"Umlaut" (m.), noun

The German alphabet consists of 26 characters plus 3 umlauts: ä, ö and ü.
The two dots above the letters do NOT indicate an accentuation or emphasis of the syllable (as for instance accent-bearing letters in Spanish or French). Umlauts are used as independent characters in the German language.

Whenever the use of umlauts is not possible (e.g. for technical reasons, in email addresses or names of websites), umlauts are indicated by the following combinations:
“ae” = ä, “oe”= ö, “ue” = ü.

Note:
some proper names contain the converted form of umlauts
(e.g. the author is spelled Goethe NOT Göthe)!

Pronunciation:
The letter ä is pronounced like the a in “apple”.
The sound of the letter ö is similar to the sound in “earn” or “bird”.
The letter ü is the most difficult for those who are learning German. It is the same sound as the u in the French words “musique”, “chaussure”, “rue”, ... etc.

This thing (¨)

Visible nipples under thin clothing.

"Whoa, did you dig that girl? Total umlauts, man!"

Thë twö lïttlë döts äbövë lëttërs. Öftën föünd ïn Gërmänïc längüägës änd mëtäl bänd nämës.

The nickname Jason Stiles has for Lorelai Gilmore. An umlaut looks like ( ¨ ). Since the two dots look like nipples, he calls her that to reference an incident they mentioned earlier, when Lorelai's nipples were visible under her wet T-shirt.