A gringo or gringa (male/female variants) is a backpacker, tourist or traveller most commonly identified by Merrell shoes, unkempt hair, unwashed clothes, loud voice and bad dancing. Gringos/gringas can be seen sporting colourful cardigans with repeated alpaca patterns to slob around in whilst watching movies in their hostels.
Other uses: gringoland (tourist hub, very little cultural authenticity here, unless you’re talking homogenised culture); the gringo trail (the safe path that travellers follow through Latin America where they will inevitably bump into the same gringos/gringas time and time again).