I have seen fist bump mentioned in some books, and would like to know what it means.
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It's when two people are bumping their fists together.
A fist bump (also called dap, pound, fist pound, bro fist, spudding, fo' knucks, box, Bust, pound dogg, props, Bones, respect knuckles, or bumping the rock) is a gesture similar in meaning to a handshake or high five.
A fist bump can also be a symbol of giving respect. It can be followed by various other hand and body gestures and may be part of a dap greeting. It is commonly used in baseball as a form of celebration with teammates, and with opposition players at the end of a game.