By Natalia Baage October 22, 2009Marcus Davis, sometimes better known as "The Irish Hand Grenade," posted the reasoning behind his nickname today via Twitter. While Davis is a self-described "UK Mutt," his mother is Irish and his father is Welsh/Scottish. "the nick name I.H.G. was given to me back in 1993. I was a Pro Boxer at the time and fighting for a group with strong ties back to Ireland" "1 of the older gentlemen kept calling me the I...