Urban Dictionary

Forget about learning Spanish or Chinese. The language you really need to know to keep up — in the U.S. anyway — is street lingo. To stay hip, visit Urban Dictionary, which has millions of user-submitted words and definitions. Visitors can vote on the best entries and choose the word of the day, like "boyfriend bomb" (when the woman you are interested in reveals that she has a boyfriend) or "text support" (encouragement from friends sent via text message). To translate your kids' geek speak, check out the Internet Slang Dictionary & Translator, which includes the top 25 slang words that parents should know and a quiz to find out if you're clt (cool like that).

—Anita Hamilton