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Meccha means very or really. Meccha comes from mecha-kucha ni. Mecha-kucha means awfully, chaiotically. Japanese people often say that mecha-kucha takaine, which means it is very expensive.
Meccha is used among younger people nowadays, instead of mecha-kucha. Originally Meccha is used in Kansai area (around Osaka). Younger people tend to use Kansai dialect to sound more posh.