1. A federal republic located in Central/Northern America.
2. A meteorological phenomenon occasionally occurring in the southern and central parts of Europe, during which fine dust from the Sahara desert is being carried north by the wind, tinting the surroundings in a yellowish tone. A reference to the mannerism of US movie makers to overlay scenes set in hot areas - most prominently Mexico - with a yellow filter.
A: "Looks like it's pretty Mexico today."
B: "I know, I have working eyes, ya septic dinglehopper"