“Booker, catch!” is a phrase said by the character Elizabeth throughout the 2013 video game BioShock Infinite.
The game takes place in 1912, in an alternate time period in which the South American city of Columbia is now floating in the sky as part of the United States. In the game, the player takes control of Booker DeWitt, a private detective from New York who’s gambling habits have caught up to him, so in order to pay back his debt collectors, he must travel to Columbia and find a girl named Elizabeth and bring her back unharmed. However, Zachary Hale Comstock, the city’s ruler, believes Elizabeth to be part of a large prophecy, with Booker being named the ‘False Shepard’ and Elizabeth being named ‘the Lamb of Columbia’, referencing the fact that he wants to escape the city with her to pay off his debt. Comstock sends his followers, known as the Founders to kill the False Shepard and bring the Lamb back, so in order to make it out alive, Booker and Elizabeth team up to escape the city and get to New York.
Throughout the game, Elizabeth can assist Booker in gunfights by bringing in objects such as medical supplies or turrets from alternate worlds through ‘tears’ in their reality. This meme branches off from her assistance, as she can also find medical supplies and ammo to throw to Booker, in which she will alert the player by saying she’s found something, with phrases such as “Ammo! Take it!” or “You’re bleeding!”, with the most common saying being “Booker, catch!”. Because the phrase is mentioned many times throughout the game, it has become a inside joke amongst BioShock fans along the lines of “Would you kindly” or the Andrew Ryan speech from the first game.