Drive-Away Dykes is produced by Ethan Coen. Coen also wrote the movie, along with his wife Tricia Cooke.

Synopsis from Cinema Blend:

    “Uptight Jamie and free-spirited Marion are lesbian friends – just friends – who leave wintry Philadelphia for a Florida vacation. On the way there, however, a flat tire on their one-way drive-away car sends them looking for a spare. The car trunk has one, but also contains a hatbox in which a severed head is packed in dry ice. Stranger still, there is a foam-lined attaché case holding a row of plaster casts…of erect penises.
    The mystery horrifies Jamie and amuses Marion. It complicates a relationship already freighted by Jamie’s unconfessed attraction to Marion, and by Marion’s appetite for parties and casual sex. The girls argue about how to address their gruesome discovery, unaware that the owners of the car are hunting for their vehicle – and for the girls to whom it was inadvertently given.
    Intrigue, comedy, and sex come to a climax as the pursuers finally catch up with the girls, while the girls come to discover how they feel about each other and about plaster penises. The shocking story behind the severed head and the phony phalluses is revealed as the girls triumph over their evil – and repressed – antagonists, and prove that love is the ultimate road trip.
    And along the way there have been laughs, thrills, psychological insights, and plenty of hot lesbian sex…”

Doesn’t sound like a film starring Selma Blair and Holly Hunter, does it? It is. I think that’s supposed to make you want to see it, and yet my desire remains non-existent.