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1.
1) Not being sure whether someone is being sarcastic or not.

2) Having difficulty in deciding if the statement is ironic
"I couldn't tell if she was being serious or not when she asked me out... I was compleatly unsurecastic!"
by Stephanie Newman December 07, 2008
 
2.
Not being sure if someone's being sarcastic or not
"I love that new shirt!"

"Are you being sarcastic? I can't tell. I'm totally unsurecastic!"
by Qwirty November 09, 2008