From the publisher's website:

Geek Out!™ is the outrageous game that finds out once and for all which player is the most knowledgeable about your favorite pop culture subjects! In the game, you will draw cards asking you to list things which fall under a certain category. Before you begin, however, the other players may try to steal your points (and bragging rights!), by bidding to list even more than the card requires. The bidding continues until one player is ready to “out-geek” their friends. Will you Geek Out!™ over comic books, fantasy, games, science fiction and more? You don’t have to be a geek (but it helps!) to win this amazing social interaction and bluffing party game of geek lists!