Schultz: They DID blow up the ammo supply!
Le Beau: No kidding!
Schultz: You all knew it, before it even happened. How? H-how did you know it?
Hogan: Schultz, we know nothing, we see nothing, we say nothing!
Schultz: We know nothing, we see nothing, we say nothing. Very good! I'll have to remember that.
Hogan: [To Schultz about the Medical officer] Schultz, I want you to stall him for three minutes, then the Kommandant can see him.
Schultz: But why?
Hogan: We're trying to save Klink from the Russian Front. And if we save him...
Schultz: He will save me!
Hogan: Right. Now get going, raus, raus!
Schultz: Ja Wohl, herr Kommandant! I mean, Colonel! Oh, I don't know what this war would be without him.
Schultz: [To Hogan about Newkirk in a Gestapo uniform] I must report this. It would be worth my life if I do not report this.
Hogan: It's only until tomorrow. He's gonna take it off again.
Schultz: Aahhh.
Hogan: After he steals the tank...
Schultz: Ohh?
Hogan: from the Panzer division...
Schultz: Ohhh?
Hogan: and brings it here into the barracks.
Schultz: Oh, I see nothing, I was not even here, I did not even get up this morning.
Top Hat, White Tie and Bomb Sights - S1-E10
Burkhalter: Colonel, may I remind you, that we are here on official business?
Klink: Official business, yes. Monkey business, no!
Answer: Nimrod's actual identity was never revealed in the series. It was only known that he was a British intelligence agent. Nimrod was not Colonel Klink. Hogan had only implied it was him as a ruse to get Klink returned as camp commandant, not wanting him replaced by someone more competent who would impede the Heroes war activities. The term "nimrod" is also slang for a nerdy, doofus type of person, though it's unclear why that was his code name.
raywest ★
"Nimrod" is originally a king and hero mentioned in the Tanach and taken into the Bible and the Koran. His name is often used in the sense of "stalker," "hunter," and sometimes figuratively as "womanizer" as in "hunter of women." I've never seen it used to denote a nerdy person, and although I cannot disprove that connotation, I think given his role, the traditional meaning is more likely the intended one.
Doc ★
It's widespread enough that Wikipedia has an entire section on it: https://en.wikipedia.org/wiki/Nimrod#In_popular_culture