The phrase "rusty nails" refers to nails that have been exposed to air and moisture for a long time, causing them to develop a reddish-brown rust coating. Full definition
The second i launched this game it gave me cancer, I would rather eat a plate of rusty nails then play this game — Wavewiz (vghangover.com)
The artist's latest project is a giant rusty nail in the centre of the City of London. (theguardian.com)
The medium - sized, mixed - breed dogs were found exposed to the elements in a fenced yard, which was covered in piles of feces, plywood with rusty nails sticking out, cinderblocks, and other hazardous trash. (animalrescuecorps.org)