Fly-tipping is British slang for littering, it is completely unrelated to Cow-tipping
Fly-tipping is ‘the illegal deposit of any waste onto land i.e. waste dumped or tipped on a site with no licence to accept waste’. Fly-tipped waste generally consists of large items of rubbish that are dumped illegally on land instead of being disposed of properly at a landfill site or tip. Some people refer to this as ‘dumping’.
External link
FLY-TIPPING AND THE LAW a guide for the public