1) A tasty snack that is red and cherry-flavored. Came out before Twizzlers. If people say they like Twizzlers better than Red Vines, they seriously have a problem (unless if they're Darren Criss or Joey Richter or any other member of Team StarKid).
2) The delicious snack that Harry Potter and Ron Weasley discover they both like in Team StarKid's A Very Potter Sequel. Ron is always eating them in this musical. Near the end when Peter Pettigrew is about to kill Harry, Ron, Hermione, Sirius, and Lupin, Ron hold a Red Vine up to Peter and yells "STUPEFY!" Then Ron takes a bite of that Red Vine, saying, "Red Vines—what the hell can't they do?"
The act of intertwining the penises of two (gay) men presumably during sex, similar to the two snakes on a caduceus or (as the name suggests) the twisted licorice in Red Vines.
"What is it called when two gay men intertwine their penises? Like the two snakes on the medical stick? Is it called redvining?" -Angela Martin from The Office (Season 9, Episode 8)