Green’s Dictionary of Slang

swacko adj.

very drunk.

1964		L. Rosten Many Worlds 280: Hey, Buck, we get us swacko minute we get back, huh?
1984		J. Ellroy Because the Night 163: [I]n her opinion he was ‘holed up swacko in some motel’.
2002		(con. 1932) ‘Rev. of Love is a Racket’ at MovieDiva.com 🌐 Love is a Racket has electrifying language (getting drunk is ‘swacko’) great overcoats and a swanky Art Deco penthouse.