Vulgar slang. Technically this is the act of depositing half a load of semen onto each of a person's (e.g. an attractive female) two eyes. In practice the term may refer to male ejaculation near the eyes and - more loosely - as sexual activity of any kind. Umlaut can also be used to express a person's perceived sexual atractiveness. A person who is attractive or upon whom it is desirable to perform the act of umlauting is said to be "umlautable". The word "umlaut" is often used as a single world exclamation where the term is synonymous (but with more vulgar connotations) with the word "hot".
The term is derived from visual similarity of the sexual act upon the eyes to the diacritical marking of two dots appearing over a vowel in Germanic languages.
"That chick was so smokin' I umlauted right on her eyes."
"Dude, major umlautables over there."
"He umlauted her brains out."
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