This term relates to the feeling of complete and total relaxation one receives when playing in center field on a baseball team. In center field, one is the farthest away from the diamond, allowing for total isolation.
Coach: What is Roger doing out there? He looks like he's meditating!
Steve: Oh, don't worry Coach. He's going under Zenterfield.
Steve: Oh, don't worry Coach. He's going under Zenterfield.
by Slobber Pirate December 28, 2010