Maybe plumbing is different here, but here it's an absolute no-no, and considered the best way to clog up a pipe.
The Oslo Water and Sewerage Works actually has a Christmas campaign now, because people tend to flush more food grease and the like down the toilet around Christmas. They've put bright pink covers on some of the manholes, with this on it: "don't feed the rats - only poop, pee and toilet paper in here!"
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett