U mad bro?

A phrase used in non-significant disputes in online multiplayer games, generally used to entice more anger or get a player kicked/banned. For example, PlayerA might defeat PlayerB and proceed to call this player a derogatory name, reinstating his/her superiority over PlayerB. If PlayerB responds, PlayerA can say "U mad bro?" while acting calm and collected. This not only prods PlayerB to indeed become more angry, but also gives the appearance that PlayerB has started the dispute.