1. "take a stab at it"
    Unless you're telling me that you're murdering my enemies.
  2. "palate cleanser"
    Unless it's an actual palate cleanser.
  3. "fashionably late"
    Only applicable if you're wearing vintage Versace. That top from Forever 21 does not qualify.
  4. "so weak"
    My friends say this when they think something is funny and I'm always just like "?!???"
  5. "That dog ain't gonna hunt"
    This isn't old yeller sir.
  6. "Pick your brain."
    Suggested by @gabimoskowitz
  7. "Scratch the surface"
    Suggested by @daphne