When you are having sex, doggy style with a female. When she is not looking, with your index finger pointed out and thumb cocked like a pistol, lick your index finger and ram it up her asshole, thus giving her suspense and catching her off guard. This is known as "Quick Draw Mcgrawin".
Last night i was fucking this bitch, and when she was about to cum, i Quick Draw Mcgrawed her, and she screamed and came. It was funny as hell