Agent Zero

The sneaky inserting of a finger or thumb (agent) into the anus (the zero) of a sexual partner. It is paramount that the receiver is not aware of the agent (finger or thumb), and that the zero (anus) is penetrated sneakily without early detection.

Guy 1: "Yo last night I gave her an Agent Zero! She never expected it until it was in!"

Guy 2: "No way, she never knew it was coming!?"
Guy 1: "Not until my finger was in her anus!"

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