What is a fist bump?
user
This is a basic question, but I’m guessing you’re looking for a somewhat more precise answer.  To be honest, I can’t really give a precise answer, because the real history of the fist bump is really hard to trace.  You’re going to see all kinds of claims about who originated it, how it came to be, and all the many different names it goes by.  Most of these claims seem pretty subjective, and can’t really be substantiated.  But let’s take a look.  
The fist bump, also known as a “bro fist” (to evoke a certain Boston accent), is a gesture similar in meaning to a handshake or high five.  A fist bump can also be a symbol of giving respect or approval, as well as companionship between two people.  It can be followed by various other hand and body gestures (such as immediately opening the palm and spreading the fingers for “knucks with explosions”), and may be part of a dap greeting.  It is commonly used in sports as a form of celebration with teammates and with opposition players at the beginning or end of a game.  Fist bumps are often given as a form of friendly congratulation.
assistant
What is a fist bump?
user
Is this in the context of a greeting?
assistant
What is a fist bump?