British informal term for a ride on someone's bicycle or motorcycle, sitting on the seat behind the driver.
Derived from 'back' (the rear position) with the diminutive suffix '-ie' common in British slang. Emerged in mid-20th century British English in informal spoken contexts.
Ask an Australian or British kid for 'a backie' and they know exactly what you mean—it's one of those wonderfully specific playground terms that perfectly captures that thrilling fear of riding double.
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