because Duo is a Bad MF, He's half johnny blaze, Half Battletech Mercenary, Half nigga, Half Terry Bogard, The womanizer of the team, plus he and Heero are like Beavis and Butthead of Gundam, But Heero is butt-head always kicking duo's ass
and it was my 1st gundam series
here's a good example
http://www.youtube.com/watch?v=cuvY9KkXuqU
http://www.youtube.com/watch?v=X_0jsf8fi5U