(c) or copyright
Originated from an instant messaging program that automatically converts "(c)" into an emoticon of a coffee cup. Due to the often jovial nature of instant message correspondence, coffeecup has become a suitably humorous substitute for its more accurate synonym: copyright.
Andrea: i'm window surfing for new cameras right now. it's kind of depressing and i think i'll stop. i really want a new one though.
Liz: you just put me in touch with the modern age by saying "window surfing"
Andrea: coffeecup andrea 2007!!!
Andrea: i should add that to urbandictionary.com and then add an entry for coffeecup