What does Tom mean when he said “If you're a man, then do it with a 'Don'”? In episode 313 of One Piece, there was a scene referencing Tom said in the past, 




  If you are a man, then do with a "Don".


What does this mean?
I found an alternative translation of the anime:




  If you're a man, do it resolutely.


I also looked into the printed volume I own and there stands (translated in English):


  If you're a man, do it with ambition.


Those two translations are quite consistent so I'm not quite sure if Ivan's answer is actually correct.

Beside that, the manga translation I found the most online is also the one given given in the OP:



But I also found the translation suggested in St. Pat's comment:




  If you're a man, do it with a bang.