Giambi said he only dons his lucky gold lame underwear when all else has failed, the New York Daily News reported Friday.

"I only put it on when I'm desperate to get out of a big slump," the 37-year-old slugger told Portfolio.com.

Giambi said he has loaned the thong out to teammates, including Derek Jeter, Bernie Williams, Johnny Damon, Robin Ventura and Robinson Cano.

"All of them wore it and got hits," he said. "The thong works every time."