They actually used it in RFK in 2005.
Yes, but it was the name of the area where the guy sat who used to hang the "K"'s for each strikeout over the railing, down the left field line. I can't remember his handle but he was an active early poster on the MLB board. Bumsfan4 was also a resident of the area. There was always an open invitation to visit K-street for a brewski.