Snit

wiktionary

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Also perhaps from the German “ schnitt” which is a portion of beer that is smaller than a glass.

From German Schnitte(“slice”).

etymonline

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snit (n.)

"state of inappropriate agitation, fit of childish temper," 1939, American English, of unknown origin. First in Claire Boothe's "Kiss the Boys Good-bye," which gives it a U.S. Southern context. Snitty (adj.) appears to be slightly older.