Hard as nails 

Something people from the south shore of Nova Scotia say when they're referring to something that is tough, they could just use the actual term Tough as Nails but, they don't.

Guy1:HURHURHUR I'M SOO TOUGH HE HE!
Guy2:NO!!! YOU'RE HARD AS NAILS!!! HURHUR
NotStupidGuy: Um, the actual term is tough as nails, guys.
Guy1:NOOOO! YOU'RE WRONG!!

Hard as nails by MyAnonymitity October 26, 2011

as hard as nails 

someone who is hard as nails seems to have no feelings such as fear or sympathy

John is as hard as nails - I've never even seen him smile.

as hard as nails by Angelik_B March 12, 2015