1. n. a crazy, insane murderer who is a barber on the side
2. v. to violently slit one's throat with barber tools
3. adj. dangerously crazy; violently wild
1.I think my ex-convict barber might be a Sweeney Todd. I think I'll skip my haircut.
2. Did you hear how that villian swore to Sweeney Todd the hero? Better watch his throat.
3. Dude, this mosh pit is too Sweeney Todd for me. I'm leaving before I get hurt.