A frozen cumshot is when 2 or more people engage in sexual intercourse in an area with freezing temperatures (E.G. Sibera), and the cum freezes onto the skin.
man: "IM BOUTTA BLOWWW"
woman: "I'm about to get a frozen cumshot because I am engaging in sexual intercourse in Sibera and the cum will freeze onto my skin due to the freezing temperatures."
"Larry gave me a frozen cumshot when we were in Sibera."