It's a word that was originated in the Love Island game and it is used to refer to someone that sniffs out gossip from one or more people and then spreads it to alot of people, just like how someone might sneeze improperly and the snot would touch alot of people

Someone that listens to (sniffs up) gossip and spreads it around to other people (sneezes it out)

Someone who does not participate in, promote or generally engage in office gossip.

intriguing gossip that is so shocking that brings much revelation that it's hot (temperature wise)

When someone posts on their Facebook status just enough vague information to keep people talking and asking questions, thus promoting further gossip.

a magazine or blog containing rumor, speculation, and trivial information, generally about celebrities. Often presented in a catty manner.

In New York City like most other cities, there is the west and the east and the south and the north. Blair Waldorf, Serena van der Woodsen, Nate Archibald, all live the luxury life in the Upper East as Jenny and Dan Humphrey live the not-so-fun middle class life in the Upper West.

A certain "Gossip Girl" character tells the story of those characters. Blair the sensitive drama queen, Serena the slut but also of a heart of gold, Nate the stoner-boy who's so much more, Dan the Shakespeare and Romeo at the same time, and Jenny the ninth grader with the big boobs who would trade it all for an East sider's life.

This book is great, and the only people who will hate is are those who are jealous of the rich kids. Otherwise, you will be ADDICTED to it!!! Even one of my friends who is completely anti-book reads it!!!!