Rooftop Haskell Share definition Flag Manual sex (i.e. a handjob) in an occluded location eg a car, in the woods, or on a rooftop. "Bunny and I fucked off to the alley for a Rooftop Haskell." Rooftop Haskell by tchatterly July 28, 2018 Get the Rooftop Haskell mug.