noun

• (attributive) Material or resources of poor quality or low value, especially resources that lack commercial value.
  "junk food"
• (slang) Any narcotic drug, especially heroin.
  "The poor fellow took so much junk into his system he could only weather the greater proportion of his day in that chair with the lamp burning at noon, but in the morning he was magnificent."
• (slang) The genitalia, especially of a male.
  "I'm talking about everybody getting crunk, crunk / Boys tryin' to touch my junk, junk / Gonna smack him if he getting too drunk, drunk"
• (nautical) Salt beef.
  "My physician has ordered me three pounds of minced salt-junk at every meal ."

verb

• (transitive, informal) To throw away.
• (transitive, informal) To find something for very little money (meaning derived from the term junkshop)
  "(On Facebook, a record collector wrote:) "The newest addition to my Annette Hanshaw collection, I junked this beautiful flawless E-copy within walking distance from my house.""

noun

• (nautical) A Chinese sailing vessel.