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1.
The finger used most often or unusually during a sex act, typically identified by its comparatively stronger scent.
One whiff of my action finger was enough to both wake her up and remind her to regret what we'd been doing last night
by bretDouglass October 25, 2008
 
2.
Fingers so active that when they reach a womans body they make her melt in your hands.
i was kickin it with chelsea last night and she fell in love with my action fingers when i started carrasing her body.
by Hance June 05, 2007