To be upset, distraught, angry, annoyed, pissed, ...etc. For someone to be “hassy about it”
I spilled my coffee and I’m hassy about it” or “I heard her yelling, she must be hassy today”
by GenerallyDumb June 18, 2019
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Acting like a fool. (usually said in a british accent)

Julia, stop that hissy hassy!
by adribaha January 10, 2008
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