A person whose significant other is in another country. Normally used in relation to those serving in the military and those married to someone serving in the military.
EX 1*-Person A: "She's hot!! Is she single?"
Person B: "Naw man. She's a geographical single, though."
EX 2*-Person A:"Hey, long time no see! Cute kids!Are you married now?"
Person B:"Eh, I'm a geographical single mom."