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1.
Alt. Mario Brothers, Mario bro's
The Mario brothers (Mario Mario and Luigi Mario) from the popular Nintendo games.
Yo the Mario bros keep hatin' on the Koopa's.
by Dick-ioio April 30, 2006
 
2.
One who must always "one up" someone
Person: Hey so I got a new phone! It's a nokia
Mario Bro: Well I got the new iphone
Person: Nice! I also got a new windows computer
Mario Bro: I have the new imac
Person: Dude....quit being such a mario bro
by awesomepersonofawesome December 07, 2011