The unpleasant realization that, when assembling a purchased product, the painful discovery that the manufacturer has not included enough screws, bolts, nuts, etc. to complete the assembly. The word is derived from the character of Scrooge depicted in Charles Dicken's "A Christmas Carol". The word represents the frustration created by a manufacturer's miserly policy of not spending just a few extra cents to make sure enough parts were provided for proper assembly
Jack was assembling the bicycle he had bought for Johnny, but found out he was screwged when there weren't enough bolts supplied.
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