wellie

noun
  1. 1

    Wellington boot.

  2. 2

    Force on a pedal or increase to any fuel or power for an engine or motor.

  3. 3

    Force or effort.

    โ€œCome on! Put some welly into it!โ€

Source: https://en.wiktionary.org/wiki/wellie, https://en.wiktionary.org/wiki/welly