look up any word, like the eiffel tower:
 
1.
Proper Noun.
1. One of several popular nicknames given to the most thrilling basketball player in the NBA, Gilbert Arenas. A two time all-star renowned for his ability to score as time in quarters, halves, and especially games expire, Agent Zero currently stars at guard for the Washington Wizards. Agent Zero sports the jersey number 0 because he was told as a high school player that he would spend exactly zero minutes on the court as a college player.

2. A man with phenomenal swag.

3. Hibachi, The Black President, The East Coast Assasin, Quality Shot
Ex. 1. Does Agent Zero have a conscience?

Ex. 2. I hear Agent Zero is writing a children's book aimed at reinforcing good childhood behavior titled "Dropping Things on People is Bad, Unless You're Dropping 60 on Kobe."
by Big Money NiMo February 20, 2007
 
2.
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!"
by Scoticvs September 29, 2009
 
3.
a.) the act of indefinitely suspending a romantic/sexual relationship with vague assurances that the association could be re-established at some unidentified later date.

b.) being indefinitely suspended by a romantic/sexual partner without a clear understanding of the seriousness of their intentions.
"He was great in bed but I still have that hottie special agent to go out with and my ex-boyfriend visiting in a couple months. I think I'm going to have to pull an Agent Zero."

"He lives across the country but we have a really special connection - we didn't break up but he says he needs some time to himself, do you think I've been Agent Zeroed?"
by jazmyn13 January 13, 2010