Definition of tin cans:
(n) :
A container, usually cylindrical, made out of sheet metal coated with tin, or (by extension) aluminum.
(n) :
(slang) An inexpensive car.
(n) :
(slang) A motor home or trailer.
(n) :
(nautical, slang) A destroyer.
(n) :
(science fiction, slang) A metal spaceship or space station.
(n) :
(informal, sometimes derogatory) A nickname for a robot or artificial intelligence.