(noun) The act of masturbating as described by the perspiration one gets in the ankle area, due in a large portion to one's vigor and/or pulled-down pants.
Adam: Where's Dylan?
Rob: Giving himself sweaty ankles.

or

"I have no girlfriend/boyfriend, I'm horny as fuck, so I'm gonna go home and sweat my ankles."
by JackNarrator June 12, 2008

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