Green’s Dictionary of Slang

1. (US teen, also groaty, grodie, grotey) disgusting, unpleasant; also as n., a disgusting person; often ext. as grody to the max [to the max under max n.].

1961		Long Beach Press-Telegram 14 Dec. 8: A grody is a murgatroid, or a square also.
1966		Current Sl. I:1 2/2: Groady To be unkempt or untidy.
1968		Current Sl. III:1 8: Groaty, adj. Physically unattractive.
1982		Frank Zappa ‘Valley Girl’ 🎵 And the lady like goes, oh my God, your toenails / Are like so GRODY / It was like really embarrassing / She’s like OH MY GOD, like BAG THOSE TOENAILS.
1987		C. Hiaasen Double Whammy (1990) 234: A sexy high-class girl like you can’t be sneaking off with a grotey redneck bass fisherman.
1988		Eble Campus Sl. Mar. 5: grodie – dirty, foul, gross.
2002		‘Valley Girls’ on Paranoiafanzine 🌐 Eeew! Grody to the max! I mean, I cannot believe you even chose this mega-dick. You must be a complete jel or something. I mean, barf me out, gag me with a spoon! Gross!

2. (US campus) noisy, vulgar, e.g. of a party.

1966

Current Sl. I:2 3/2: Groady, adj. Coarse or noisy, esp. a noisy party.