Meaning of backie in English:

backie

(also backy)

Pronunciation /ˈbaki/

nounbackies

informal British
  • A ride given to a passenger on a bicycle, in which they typically sit on the saddle and hold on to the cyclist, who stands up to pedal.

    • ‘ask him nicely and he might give you a backie on his BMX’

Origin

1980s from back + -y.