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1.
A political activist who uses his/her reputation for activism, organization, and political ideology for the purpose of hitting on people.
A man claiming to be a feminist, making grand declarations about sexism and how he's not a sexist, and then uses this in order to sleep with as many women as possible while sexually commidifying those women is a mactivist.
by digital.nines April 12, 2006
 
2.
Someone who vigorously campaigns for Apple products as if the brand was a political cause or religious sect.
Person A: Why does that guy always walk around from person to person to brag about how cool his iphone/ibook/mac t-shirt is?

Person B: He's a Mactivist... spreading the good word is his life's work.
by imapc July 17, 2009