1. A male federal agent working for one of the common three-letter acronym (TLA) agencies, i.e. FBI, CIA, NSA or DHS.
2. A clean cut, usually white, male who looks like he may work for a government agency such as the FBI, CIA, NSA, or DHS.
Guy 1: "Did you see that alphabet boy take that bank robber down?"
Guy 2: "Daaamn"