Definition of wayback
US, informal
: the area in the back of a van, station wagon, or SUV
… the scant storage behind the third seat. The seatback folds, but the only way to open up the wayback is to remove the third seat entirely.— Michael Lamm
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Merriam-Webster unabridged
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Time Traveler for wayback
The first known use of wayback was in 1980
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