Ghoulies: They are the the Southside Serpents' rival gang that just won't go away.
Greendale: This is a neighbouring town that's the home of Sabrina Spellman and the city Mrs. Grundy moved to before she was murdered by the Black Hood in season two.
Grind'em: Yep, you guessed it, this is the show's version of Grindr.
Gryphons & Gargoyles: As Riverdale's rendition of Dungeons & Dragons, this board game is what Dilton Doiley and Ben Button were playing at Pop's in the season three premiere.
Here's the wheels, Baby Jane: Cheryl Blossom has said this punchy idiom that apparently means, "This is how it's gonna be, b*tch." It's presumably a reference to the 1962 film Whatever Happened to Baby Jane?
Ho Zone: This is the name of Riverdale's strip club — we're not kidding, that's really what it's called.
Innuendo: In case you were wondering if Riverdale is inclusive, the town at least has a gay bar.