Frunk Share definition Flag 1.To get drunk in a manner without paying a cent. "Free Drunk" Also known as Frunkenness 2.Could also be "Fucking Drunk" together 1. -How'd Julie get SO trashed? I thought she said she didnt have any money!? -Well she obviously got frunk, by getting Fralcohol off of randoms. 2. -Dude, I am SO FRUNK right now! I'm spoo gladdd I cmae to le party without cash! -Word. Frunk by DDShade August 8, 2006 Get the Frunk mug.