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A pseudo-activist who participates in marches and other activities so that he may have access to cute girls who believe in saving the planet. A compounding of "to mack" and "activist." For obvious reasons, this noun has no feminine iteration.
Look at those boys with the "Peace Now" sign -- they ain't nothing but macktivists.

From what I hear, the treasurer of the campus Green Party is a total macktivist.
by Brendan Baber July 17, 2004