M974E990K12 - a code so secret it’s like the G. Unit’s best-kept fart, and

a code so secret it’s like the G. Unit’s best-kept fart, and you’re not supposed to know about it.

The G. Unit’s best-kept fart is the M974E990K12 code.

I know about the M974E990K12 code, and now I can tell everyone about the fart.

The M974E990K12 code is so secret, it’s like a secret inside a secret.