Commonly used when two guys or friends are arguing and one friend brings up a point to counter his friend point, but in theory it is just a stupid and or irrelevant point.
Steve: Do you ahve any enemies? what about the guys you jipped on the deal..
Joe: How did you know about that!?! Well what about you and not going to help Bob in the bad deal he made?
Steve: This is no time for dick measuring, who did you do a bad deal with....