Green’s Dictionary of Slang

grungy adj.

[SE grubby + SE dingy]

1. (also gringy, grungey) dirty, messy, unappetizing, unappealing.

[US] in Current Sl. (1967) I:4 4/2: Gringy, adj. Dirty.
[US]L. Bangs in Psychotic Reactions (1988) 9: Count Five [...] weren’t so hot at it actually but ripped their whole routine off with such grungy spunk that I really dug ’em the most!
[US]J. Wambaugh Glitter Dome (1982) 153: Captain Woofer said to send him a pair of grungy, ugly, filthy, hairy, disgusting, creepy scumbags who would fit in with the run-of-the-mill Hollywood street folks.
[Aus]R.G. Barratt ‘So Why Doesn’t Jack the Lad Get a Real Job?’ in What Do You Reckon (1997) [ebook] [A]n even bigger, grungier pit [...] with a kitchen that looked like Dr Jekyll’s lab.
[UK]N. Cohn Yes We Have No 54: It was a basement warren, dark and grungy.
[UK]Guardian G2 4 Apr. 22: You might have expected the New Eastenders to dispel the notion of [...] the grungey hemisphere of the artists.
[US]C. Hiaasen Nature Girl 124: Some grungy swingers’ club he’d dredged up on the Internet.
[Aus]L. Redhead Thrill City [ebook] Everybody else was ripping off Charles Bukowski [...] writing grungy pieces about [...] taking drugs and vomiting and passing out.
[US]J. Stahl Happy Mutant Baby Pills 133: She plopped her bag on a chair at the far end of the grungy fun-terrace.

2. (also grungey) dressed in the style of grunge n. (4)

[UK]A. Warner Sopranos 62: Three grungy-looking guys.
[UK]Guardian 28 June 7: With his grungey band Dog Star [...] he is also a musician.
[UK]K. Sampson Powder 306: The Grams, they told Todd, didn’t support no fucker, let alone some grungy bunch of doom-angst merchants from Arkansas.
[UK]Indep. Mag. 20 May 16: A bunch of guys dressed in grungy clothes.