The question yelled by a person who has just done something amazing. If anyone answers by yelling 'You da man!' then this person has succeeded at being awesome. However, if nobody answers then this person has failed.
by LeggyBerg December 10, 2011
"hey guys guess what i bought from Ebay? The Bucky O'Hare DVD!!, Who Da Man???" "Wow!!,you da man!!"
by piemaster August 5, 2004