I never did the bro handshake/chest bump until I started University in September. I always thought it was weird and I was so paranoid about looking stupid
Now I do it all the time, it's easy! You just clasp hands as if you were gonna arm wrestle (the walk up is important too, when you go to grab the other guys hand do it confidently but kind of casually like your going to slap a booty). Then once you clasp hands, hold it and bring your hand to your chest so you come chest to chest with the other guy and then kind of hug with the other hand. Then you release and do a proper handshake to finish.
C'mon ATRL, let's get butch!