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1.
describes something that is difficult to do and causes a lot of worry for the person involved in it.
My AP exam was the most nerve-racking thing I've ever experienced.
by Disorder13 July 22, 2005
 
2.
When something or someone gets on your LAST nerves, or irritating to a high degree.

See annoying
"My three younger cousins are nerve-racking; they're always bugging me!!!"
by A-Town Boi July 14, 2009