Yeah if memory serves, Tom said it was from the Gary The Squirrel 7" from the 2013 marathon.
WFMU rotates their schedule every six months. They do it to give new shows a chance and let DJs take some time off if they want to. I think she said during the show that she needs to take a break. Understandable, given that she's done a 3 hour weekly radio show for almost 15 years.