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Usually referring to someone being a really bad impersonation of an iconic figure. The term "Great Value" being used before someone else's name references the ever-so-famous Wal-Mart brand that tends to rip-off other product brands, but with less quality and also a cheaper cost too, so calling someone a Great Value version of something else is pretty much a diss or insult to them.
by bitstripslang December 02, 2016