This guy and I work together on a project and I make a breakthrough (did something innovative). He gave me a fist bump after I told him about it.
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A fist bump, in Western society, denotes a feeling of congratulations from the giver to the recipient. Often a gesture of bonding between bros, it has evolved into a more unisex form of saying "Hey man, that was awesome. Good job".
Alterations of the fist bump could be a game of bloody knuckles, where participants try to draw blood to their opponent by way of striking said opponents balled fist. But this is usually a completely separate entity from the actual "bro fist" experienced in comradery.0