adj

• (figurative, slang) Having counter-culture sensibilities; nature-loving or hippie; wholesome, health-conscious.
  "San Francisco was a very crunchy town."
• (music, informal) Of a chord, containing dissonant intervals.
• (informal) Of an image, pixelated, grainy, or exhibiting blocking, often as a result of oversharpening, a low resolution, or aggressively applied lossy image compression.
  "This can result in the image looking very crunchy as pixels are skipped - especially if you choose the "Fit" option in the Magnification popup. Don't panic; your final image won't look that bad[…]"

noun

• (usually in the plural) A pellet of dry cat food.
  "Finally she paws a crunchy out of the bowl, bends her head, [and] eats it."
• (military slang) An infantryman, as opposed to a tanker (combatant manning a tank).
  ""Inside, tankers carry full-length M16s for crew protection from crunchies.""