(CNN) -- Don't be a denialist. Instead put on your jeggings (breathe in) or mankini (be careful) and retweet this article. After all, it's hip to be in the know on the 400 new words and phrases in the 12th edition of Concise Oxford English Dictionary, the abridged version of the Oxford English Dictionary. The smaller dictionary is meant to "cover the language of its own time." Beware: Not all words are built to last, wrote dictionary editor Angus Stevenson in a blog posting last week. "Sadly, the new edition has no room for tremendous words like brabble 'paltry noisy quarrel' and growlery 'place to growl in, private room, den' -- what we might call a man cave these days," Stevenson wrote on a blog. Some of the new words: -- cyberbullying: n. the use of electronic communication to bully a person, typically by sending messages of an intimidating or threatening nature. -- denialist: n. a person who refuses to admit the truth of a concept or proposition that is supported by the majority of scientific or historical evidence. -- jeggings: pl. n. tight-fitting stretch trousers for women, styled to resemble a pair of denim jeans. -- mankini: n. (pl. mankinis) a brief one-piece bathing garment for men, with a T-back. -- retweet: v. (on the social networking service Twitter) repost or forward (a message posted by another user). n. a reposted or forwarded message on Twitter. -- sexting: n. informal the sending of sexually explicit photographs or messages via mobile phone. -- woot: exclam. informal (especially in electronic communication) used to express elation, enthusiasm, or triumph. The dictionary also adds new definitions of familiar words. Thought a cougar was just an ornery old cat you might encounter in the American West? By now you know a cougar also is "an older woman seeking a sexual relationship with a younger man."