Much like a
showdown, only between brothers. Two brothers link thumbs of the preferable hand and use their
free hand to slap the back of the linked hand
util one brother breaks the chain.
Example of a brodown:
Guy1:Hey, dude!
Guy2:What?
Guy1:Bob and Joe just had a browdown!
Guy2: Who
won?!?
Guy1:Joe!
Guy2:Sweet!