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The term dap may have originated as an acronym for dignity and pride, or may have been backronymed. According to one tale, it was introduced to and popularly used by African-American soldiers by Marine Captain John Dapolito during the Vietnam War. It appears to have been introduced to Western culture through film. For example, the 1936 movie Tarzan Escapes depicts the gesture.
Though it can refer to many kinds of greetings involving hand contact, dap is best known as a complicated routine of shakes, slaps, snaps, and other contact that must be known completely by both parties involved. Dap greeting sometimes include a pound hug.
Increased familiarity and use 
The dap gained widespread attention when a fist bump took place between Barack Obama and his wife before his 2008 presidential nomination victory speech, resulting in a number of press articles explaining this custom.
Elaborate examples of dap are observed as a pregame ritual performed by many teams in the National Basketball Association. These choreographed actions are rarely televised and serve as a superstitious means of psychological preparation and team solidarity.
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There are many variants of complicated hand-shake gestures.
- The "Lock and fly" is used in the West Indies and Caribbean Islands and popular among the Rasta community. It consists of two movements: a full flat-palm grasping of a partner's hand followed by sliding of the palms in a forward motion finally finishing with a flexion and extension of the fingers.
- The "Daps Explosion" is recognizable by the opening of the fist and fist's departure from its original location with the intent to mimic an explosion.
- Dr. X's Free Associations, "Photo of the Day: First Documented Knuckle-tap (Dap) Greeting", March 4, 2008
- Obamas deal out some dap, Kelly L. Carter, Chicago Tribune, 9 June 2008.
- Media treat Obama like an artifact of a foreign culture, Eric Deggans, St Petersburg Times, 15 June 2008.
- Sargent, Scott. "The Secret World of NBA Daps". SB Nation. Retrieved May 1, 2013.