And, hey, aren't people supposed to stop being snitty after three months of going smokeless?
http://www.marketingvox.com/archives/2003/08/...

Carnivores find vegetarians to be snitty little wusses
http://www.boredbutbusy.com/2004/03/12/

A compendium of languid come-ons, snitty retorts, blasé metaphysics, jaded declarations of love, and histrionic expressions of lust taken from the best
http://www.alyson.com/html/99_intros/1199/119...

I think that was a hint that she could be snitty. But everyone can be snitty if pushed too far, and she might have been - not by Sydney, but by the situation
http://sd-1.net/lofiversion/index.php/t23690.html

Onelook liefert keine Ergebnisse, in div. slang-Wörterbüchern finde ich auch nichts rechtes.
In LEO steht 'snit' "Frustration", darauf und auf obige Textbeispiele stützt sich mein Versuch einer Wiedergabe.

Chapman, Dictionary of American Slang
snit or snit-fit n
A fit of angry agitation; = SWIVET:
He goes into such a snit that he ploughs the car into a wall -- Saturday Review
He has a reputation for throwing considerable snits -- Car and Driver
And we forget about our little snit-fit in there ... -- Carsten Stroud

http://www.probertencyclopaedia.com/ZSF.HTM
Snit is American slang for a state of agitation, rage or a sulk

http://www.urbandictionary.com/define.php?ter...
1. snit
a person that is being really bitchy
Oh my gosh, Ms. Wallingtosh was being such a snit to me in class today!

Is there any chance it could be "snotty" instead of "snitty" ('i' is next to 'o' on the keyboard, so it could be a typo)? As for 'snit', I found the definitions above.