411 Definition
fôrwŭnwŭn
noun
Information or knowledge, especially when acquired by word of mouth.
American Heritage
(slang) The latest scoop, information or news.
Guess what?! I have the 411 on Nick and Judy's breakup.
Wiktionary
Origin of 411
Based on the telephone number used in North America to obtain telephone numbers of listed subscribers.
From Wiktionary
From 411 a telephone number for telephone directory information
From American Heritage Dictionary of the English Language, 5th Edition
