In the mid Illinois region such as any area between Chicago and Joliet this word is used to define an individual after he/she does something stupid, ridiculous, or embarrassing.
Cue your friend forgets his wallet at home.
You say ah you're a Salty dog.
Salty Dog: someone with a insane foot fetish, that wants to lick toes, feet and legs. They suck and lick the salt off of them. Obsession with toes and goes manic and mad with lust for toes and feet.