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I'll copy from Meta:

I admit I'm sometimes too quick with the gun when firing away questions.

Does the feeling "Damn, I just asked this now, and I see it's a dup of a question I asked three years ago" have a name?

Preemptive word for the smart: "Lazy" is a good term for the asker, but not for the feeling.

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closed as too localized by Kit Z. Fox, JSBձոգչ, FumbleFingers, Mitch, waiwai933 Jan 19 '12 at 16:14

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Tagging suggestions are welcome. – ripper234 Jan 19 '12 at 9:25
Did you check if you asked this question already? – Kris Jan 19 '12 at 9:28
Vaguely related: in The Meaning of Liff, the definition of Woking is "Standing in the kitchen wondering what you came in here for". – Benjol Jan 19 '12 at 10:02
I think it's called 'Doh!' – Benjamin Jan 19 '12 at 12:03
I think that this question is too localized to meet our standards. Also, you haven't really even given an approximation of how it makes you feel (angry, empowered, stupid, awkward, proud, titillated?), or offered any guidance on why certain words you have thought of don't meet your criteria. Therefore, I am voting to close this question. – Kit Z. Fox Jan 19 '12 at 13:22

I offer the term déjà vu. Though not literally true, it captures the spirit.

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The term déjà vu refers to the feeling when one feels like he is experiencing something for the second time (but not sure why). I don't think the asker meant this. – Meysam Jan 19 '12 at 12:38
@Meysam: It literally means "Seen already", which is an accurate (but not complete) description of what is happening. – Marcin Jan 19 '12 at 12:41
@Marcin It means that in French, but this is an English forum. – Pitarou Jan 19 '12 at 12:54
@Pitarou: It is so understood also in English. – Marcin Jan 19 '12 at 12:58
It's not really Deja vu. Deja vu, for me, is when I have two moments in the space-time continuum that feel as if they're the same moment. Both the earlier and later moments would have to include this feeling to be really identical. In my case, I only experience this feeling on the later moment. – ripper234 Jan 19 '12 at 13:15

Perhaps chagrin is the word you are looking for.

chagrin \shuh-GRIN\, noun: 1. Acute vexation, annoyance, or embarrassment, arising from disappointment or failure.

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I removed the tag america-english, I just didn't know what to tag this. – ripper234 Jan 19 '12 at 13:14
@ripper234, thanks; I've removed the reference from the answer. – Brian Hooper Jan 19 '12 at 14:05

You could use something as simple as- memory lapse!

Or probably the sentiment could be described as feeling sheepish, discomfiture, vexation, chagrin.

If you want to put it light-heartedly, you could say, you are mortified at your temporary amnesia.

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