A Yooper — a resident of the upper Peninsula of Michigan — is one of the 150 words added to the 11th edition of Merriam-Webster's Collegiate Dictionary.
Many of the new words stem from our digital life, like selfie, hashtag, unfriend and tweep.
The latest edition also includes food-related words, like turducken and pho.
Merriam-Webster relies on a network of observers who track down word usage, and then a few senior editors make the final cut.
Peter Sokolowski, a lexicographer and editor-at-large for Merriam-Webster, said a word is added only when editors are sure it has staying power.
"One of the most important things we have to watch is the trendiness of language, so we don't want to put a word in that will then have to come out," Sokolowski told the Associated Press.
Here are some other new additions:
• Catfish: a person who sets up a false personal profile on a social networking site for fraudulent or deceptive purposes.
• Steampunk: science fiction dealing with 19th-century societies dominated by historical or imagined steam-powered technology.
• Dubstep: a type of electronic dance music having prominent bass lines and syncopated drum patterns.
• Crowdfunding: the practice of soliciting financial contributions from a large number of people especially from the online community.
• Fangirl: a girl or woman who is an extremely or overly enthusiastic fan of someone or something.