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to masturbate, particularly in a fashion that you believe to be subtle, but which is in fact blatantly obvious

Originates from an incident on a New Zealand tramping (hiking) trip: One member of the party, upon being observed to be moving his hands vigorously inside his sleeping bag, was accused of masturbating, and responded that he was just "drying my polypros." NB: Polypros are thermal underwear used in the outdoors.
"Bloody name dried his polypros in his pit this morning."
"Name, can't you dry your polypros somewhere else? I'm right next to you in the tent, mate, and I can see what you're doing."
by A. N. Outcer December 12, 2015
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