secret agents such as CIA, FBI, ATF, etc. Undercover police officer.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

You and/or someone is up to something .......They ain't saying..

A cue from an old cartoon show that was a parody of the spy genre; one of the characters was a squirrel spy. Originally meant to refer to someone working in covert operations or intelligence (undercover police, CIA, military intelligence, etc).

It is now often used to refer to people who claim to have worked in the intelligence community in online forums and in person out of context with questionable veracity - ie potential/real poseurs/frauds.

One who dissapears or acts as if he/she is sly, or does sneaky things without peers knowing. Usaully when a person is a Secret Squirrel, that person acts scary as if someone is on to them or, knows whatever the secret might be. This word comes from an Hanna-Babera created cartoon, which tells about a detective/spy Squirrel who jumps around hiding and solving mysteries. My dad also likes to call my older sister and my mother a Secret Squirrel often when playing aorund with them.

Secretly masturbating and then ejaculating, or "busting a nut" if you will, upon the face of an unsuspecting individual. Then whisper into that person's ear: "shhh...secret squirrel."

Someone you tell all your secrets to. Someone trustworthy, non-judgemental, and in the best cases good at giving advice. One may have different secret squirrels for different types of secrets, or multiple secret squirrels for all their secrets.