mod. excellent. (California.) : That was a totally massive party, Tiff.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
massive
c.1408, from M.Fr. massif (fem. massiv) "bulky, solid," from O.Fr. masse "lump" (see mass (1)). The un-Anglicized massif (1524) is also still occasionally used for "cluster of hills."