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)
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