Amidst the hoopla of the annual New York Baseball Subway Series, Yankee slugger Jason Giambi finally admitted the source of his great power: injecting steroids a golden lame thong.Even worse, he shares the underwear with his teammates when they need a butt slump buster. "It works every time," Giambi told the Daily News after his secret was outed on Portfolio.com Derek Jeter agreed that Giambi's thong works, although "it's so uncomfortable running around the bases." "I had it over my shorts...