The term "white whale" has multiple meanings and uses, depending on the context. Here are some of the most common meanings:

• A sexual act: According to Urban Dictionary, "The White Whale" is a sexual act that involves a large female being "beached" by pushing her onto the floor and then being either urinated on or ejaculated on.

• A fart: Another definition from Urban Dictionary describes "white whale" as a term for when someones nude buttocks breach the surface of the water, allowing a discharge of stale poo gas to be expelled in a spray of fine mist.

• An obsession: The phrase "white whale" is often used to refer to an activity or thing that someone is obsessed with finding or achieving, but will probably never manage to do so. This meaning is derived from the story of Moby Dick, in which Captain Ahab is obsessed with hunting and killing the white whale.

• A difficult objective: In contemporary society, "white whale" is also used as a versatile symbol for obsessive pursuit in various contexts, from sports to business. It can be used interchangeably with other expressions such as "Everest" or "ultimate goal".

• A beluga whale: In a more literal sense, "white whale" can refer to a beluga whale.

Its important to note that the meaning of "white whale" can vary depending on the context, and some of the definitions found in the search results may be considered vulgar or offensive.