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Acronym for "middle aged man with a pony tail" - a term of derision for ageing buffoons who imagine that a greying pony tail somehow keeps them down with the kids, rather than making them look like a middle aged buffoon.

Particularly prevalent among ecofascists.
Have you seen photos of that wikipedia vandal William M Conolly? - what a mamwapt!
by Justice4Rinka December 21, 2012