Definition of hissy fit noun from the Oxford Advanced Learner's Dictionary

 

hissy fit

 noun
noun
BrE
 
; NAmE
 
[countable, usually singular](informal)
 
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a state of being bad-tempered and unreasonable synonym tantrum She threw a hissy fit because her dressing room wasn't painted blue. Word Origin 1930s (as hissy): perhaps from hysterics via Latin from Greek husterikos ‘of the womb’, from hustera ‘womb’ (hysteria was thought to be specific to women and associated with the womb).
See the Oxford Advanced American Dictionary entry: hissy fit