Junk generally refers to:

Scrap, recyclable waste used to build and maintain things
Junk may also refer to:

Junk, Melon (cetacean) of the sperm whale
Junk, salt-cured meat
Junk, a common street slang for heroin
Junk (ship), a type of Chinese sailing vessel
Junk status, debt credit rating
Genitalia

Is China aware that they invented all this stuff Salty???