Patina

[Sarah]

The color or incrustation which age gives to works of art;especially, the green rust which covers ancient bronzes, coins, andmedals. Fairholt.

[Sarah]

The term that antique appraisers and collectors use to describe [word]rust[/word] or age on an old object to try to increase its value.

[Sarah]

These days is it just a pretentious euphemism for rust, used by people trying to impress others with the originality of their crappy vehicle. Previously used by antique dealers and art historians to describe things like 200 year old furniture or paintings, but now used by Joe Blow to describe a rusted '73 Oldsmobile.

[Sarah]

Verb. To throw a load of feces in a sleeping person's face. Preferably while filming for distribution on youtube. Similar to [antique].

[Justin Bieber]

a thin surface layer that develops on something because of use, age, or chemical action: