Nonsense Revolution(2008)

After a night spent drinking and partying, a group of six best friends is torn apart when they accidentally kill their bisexual friend Caz when he darts in front of their car. A year later, Caz appears to Tess as an eternally-horny angel who only Tess can see. It's up to her to reunite the remaining five friends so Caz can move on, but things don't always go according to plan.