This is most definitely an actual glitch.



This definition for the wierd juggernog glitch that causes you to be downed in one hit is so good, that from now on, I will refer to the juggernog glitch as: "juggernot".

I just caught the juggernot in Kino der Toten. I was drinking my juggernog when I was downed. Upon reviving, I still had the juggernog symbol, but the very first time I was hit, I was immediately downed.
After a few rounds wallowing in the futility of this affliction, I decided that I would investigate as many aspects of this glitch as I could, in order to inform others about it's game-killing effect.

1)This glitch can be triggered when downed while drinking juggernog.

2)This glitch does not always occur when downed while drinking juggernog. You may suffer no strange side effects of the juggernot when you are downed, it is simply the only [known] time that the juggernot can be triggered.

3)Once revived for the first time, the juggernog symbol will appear over the round number indicator.
If the juggernot glitch has been triggered, you will go down in one hit, even though the juggernog symbol is displayed over the round number. Only the first time, does juggernog not work.

4)While the juggernog symbol is active, you will be unable to buy legit juggernog, as usual.

5)Once revived the second time, the juggernog symbol will disappear, just as it would if you were to go down normally with legit juggernog. Once the symbol vanishes, you may buy legit juggernog and receive all of its legit benefit.

6) After buying juggernog again (and not getting downed while drinking it), your juggernog damage threshold is exactly the same when the glitch is active as it is when the glitch is inactive. You can take several hits without going down, as long as you have juggernog on top of your newly acquired juggernot.

Important:
In my experience, (which was unfortunately extensive due to catching the glitch in round 15 and my team's miraculous ability to survive another 9 rounds in spite of my condition), I found that the glitch was permanent.
And, when I say permanent, I mean permanent. Permanent for the ramainder of the match, no matter what you do. For the remainder of the game; if I did not buy juggernog after being revived, I would be downed in only one hit by any creature. Even after bleeding out completely, spectating, and finally respawning, I would still be downed by a single scratch.
One important exception was that nova gas poison (emitted by those small creeper creatures) would do typical damage and didn't seem to be affected by the juggernot glitch. You can run through it without going down.

Tip:
If you contract a case of juggernot and you're in a match that you just can't drop out of, my advice would be to always have juggernog and 2650+ points. That way, if you are downed, you can afford to get another bottle of juggernog right away. If you ever find yourself with less than 2000 points, down, and on round 15+, you can probably kiss any chance of being an effective player goodbye. Without a BA gun or two, it's nearly impossible to earn money for juggernog and never, ever, taking a single hit. However, if you're a BAMF with mad skillz (as I'm sure many of you are), juggernot shouldn't be too much of a problem.

From now on, if I catch this glitch (which I will avoid like the plague), I will drop out of the match after checking if my six descriptions hold true. This glitch keeps the game from being any fun at all. Watching that downs counter going higher and higher really pissed me off.

I am only reporting the information that I gathered from my misfortunate experience with the juggernot glitch. I'm not sure if all of my points hold true for all cases, even though I checked and double-checked my theories. If you have knowledge that can prove otherwise, please reply.

Black Ops: Zombies is awesome! Just don't get downed while drinking that juggernog!!!