Definitions of leaky:

• adjective:   permitting leaks or leakage

  Example: "A leaky roof"

• adjective:   permitting liquids to penetrate

  Example: "A tarpaulin too leaky to be of much use"

• adjective:   used informally; unable to retain urine
• adjective:   (of ships and boats) permitting leakage
• adjective:   prone to communicate confidential information