Green’s Dictionary of Slang

1. cocky, arrogant [piss off v. (2)].

1969		‘Iceberg Slim’ Pimp 116: You little pissy, green-ass Nigger.
1979		Maledicta III:2 222: Cinderella becomes Old Ella, the whining failure or whoring harridan, derisively hailed as madame, countess, duchess (if pissy, piss-elegant).
1986		L. Heinemann Paco’s Story (1987) 65: Even they getting picky and pissy and don’t hardly hire nobody no more.
1995		C. Hiaasen Stormy Weather 55: Somebody’s in a pissy mood.
2000		M. Collins Keepers of Truth 135: First Ed and now Pete acting all pissy over nothing.

2. irritated, angry; also as in a pissy [pissed off adj.].

1978		R. De Christoforo Grease 76: I decided it was dumb of me to get pissy with you.
1992		A. Duff One Night Out Stealing 20: Ooo, we are in a pissy.
1997		Eble Campus Sl. Apr. 6: pissy – easily annoyed, in an unpleasant mood.
2001		J. Stahl Plainclothes Naked (2002) 124: Merch was still pissy from the stroke line.
2012		J. Díaz This Is How You Lose Her 103: Mami had dealt with paper bitches before, and she never got this pissy.
2013		T. Black Ringer [ebook] n.p.: Then it blurts in that pissy, whiney, croaky voice that old cunts have: ‘I’ve called the police!’.
2017		D. Winslow The Force [ebook] He’s still pissy about the 2 a.m. roust at his place.
2023		(con. 1962) J. Ellroy Enchanters 132: Such pissy outrage.