That's Eli Manning's signature on a column in the Cowboys Stadium's visitors locker room according to an NBCDFW user.
"See the picture of a concrete column in the visitor locker room in the new Cowboys stadium," the NBCDFW.com user wrote. "I heard the locker room was spat on and had many used jock straps hanging from the mirrors and other places too. What class."
If the story is true don't judge Eli too harshly, he was probably just trying to fit in with the older boys. He's so impressionable.