This is used to describe someone who goes out into public without any shoes. Oh god, and especially at the vomit-infested and god-knows-what-else clubs. This can also be used to describe someone who is walking to or from the club without shoes. Holding your shoes in your hands? You're still a "pata sucia."
The literal translation for this phrase: "dirty hoof."
Examples of How to Use the Word
"Bro what the fu*k is she doing walking on Calle Ocho with no shoes?! Superrrr pata sucia!"
"Giovanna told me she was walking all pata sucia and sh*t at Cameo. Like, what is her lifeee, bro!?"
"You're better off wearing chancletas, than being a pata sucia!"