fly-tipping

/F L AY1 T IH0 P IH0 NG/
verb
  1. 1

    To dispose of waste (garbage) illegally, rather than at an authorized dump location.

    โ€œYou face an unlimited fine if your rubbish is found fly-tipped.โ€

noun
  1. 1

    The illegal dumping of rubbish on unauthorised sites.

Source: https://en.wiktionary.org/wiki/fly-tip, https://en.wiktionary.org/wiki/fly-tipping