a giant-size version of a product is a very large one, or the largest one available in a range:
• Food containers regarded as giant-sized in other countries are considered individual size in the US.
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giant-size UK US (also giant-sized) adjective
► extremely large: »
Because they are complementary brands, there are none of the giant-sized headaches that a merger between two car makers would create.
Financial and business terms. 2012.