Green’s Dictionary of Slang

1. (orig. US, also snit-fit) an outbreak of temper, generally a children’s term; thus snitty adj.

1939		C. Boothe Kiss Boys Good-bye 105: ‘I declare, Mrs. Rand, I cried myself into a snit.’ ‘A snit?’ ‘I do deplore it, but when I’m in a snit I’m prone to bull the object of my wrath plumb in the tummy.’ [OED].
1949		San Bernardo Co. Sun (CA) 1 June 20/4: Narure threw herself into a terrifying snit. That was the San Francisco earthquake of 1906.
1966		Current Sl. I:2 5/2: Snit, n. A dither.
1972		C. Bukowski Erections, Ejaculations etc. 424: When they got back the Walter Lowenfel poetess was in a snit, sniffling, cussing.
1978		J. Krantz Scruples 105: Their snit-fits and ailments.
1980		Batman No. 321 17: My we are in a snit, aren’t we?
1988		Eble Campus Sl. Oct. 9: snitty – hard to get along with, bitchy.
1999		T. Dorsey Florida Roadkill 159: Sharon was still in a snit.
2001		J. Stahl Plainclothes Naked (2002) 188: It’s not like I can throw a snit and say ‘Take me home!’.
2007		Chicago trib. 27 June 2/1: The face manager had just quit. No warning [...] What I call the quit snit.

2. an aloof individual.

1963		F. Kohner Affairs of Gidget 39: ‘Who is it?’ [...] ‘Some snit’ (short for stuck-up guy).
1967		E. Shepard Doom Pussy 86: She’s an aloof little snit.