RhymeZone: slinky definitions

Definitions of slinky:

adjective: Furtive, stealthy or catlike.
adjective: (Northumbria, dated) Thin; lank; lean.
adjective: Of a garment: close-fitting; clingy.
noun: (mathematics) A three-dimensional curve — a spiral wound around a helix.
noun: A toy in the form of a loose metal (originally) or plastic spring that can be made to "walk" down stairs as its coils separate and close up.

(Definitions from Wiktionary)