anyone with a mullet, plaid muscle-vest, john deere tracktor for a car, or someone who feeds there dog achohol. they are usualy uneducated, live in a trailerpark, and they may have a southern accent. basicaly another name for a redneck.
guy1: see that guy over there with the def lepard tattoo and mullet?
guy2: yah, what a Joe Dirt.
A guy who is "wack", lame, trips over himself, smells like poop, has terrible style and no chance of getting a girl. Can also be referred to as a "Joe" or simple a "Dirt.
Ulzzang true definition is "best & "face" = best face in korean. They are basically people with above average looks, sometimes with the use of photoshop and haduri who post their pics online, some becoming internet celebrities.
"Hey, see that chick over there? She's pretty enough to be an ulzzang. :D"