backie noun3 •(informal) A ride on the back of a bicycle or motorbike. •(rare) Diminutive of back (“rear of the body”).Joan—Old Fatty Witch, please, please, let us take Peter out of the Pot! Witch—Not by the hump on my backie, back, back. Before moon-up you will all be Giddy-Giddy Gumps. — 1924 •A photo taken of iconic location with the back of a shirt advert visible. formsbackies