When your forelimb extremities become deliciously pleasant-smelling after eating a big, juicy, and meaty submarine sandwich fully-loaded with toppings and dressings.
Sub hands are often common to fat people, and individuals present with them are usually avoided by anorexic whores and gay dudes.
1) "I had a fucking amazing lunch earlier at Firehouse Subs, but now I'm constantly catching myself sniffing my aromatic sub hands."
2) Girl: "Rob is so sexy, but he always has sub hands. It's such a turn off."
Boy: "I couldn't agree more with you."