having the specified property to an extreme or excessive degree; very:
"an uber fancy restaurant."
designating a person or thing that exceeds the norms or limits of its kind or class:
Also, German, über [y-buhr] /ˈü bər/ (Show IPA).
A prefixal use of uber , adverb and adjective, with the basic meaning “over, beyond.” It is added to adjectives and nouns to form compounds (uberstylish; uberchefs): a hyphen is sometimes used in new coinages or in any words whose component parts it may be desirable to set off distinctly (uber-luxe).
British Dictionary definitions for uber
indicating the highest, greatest, or most extreme example of something: America's ubernerd, Bill Gates; the uber-hip young Bohemians