When an alcoholic drink is made very very very strong. The best way to tell if you are drinking a hot cup, is when you can no longer taste the mixer. A true hot cup is one made in a very large container and is the equivalent of a week's worth of normal drinking. Hot cups are best enjoyed amongst other hot cups, a beach, or just because its a tuesday morning.
B: Dude pass me that hot cup.
K: Hot cup's getcha hot cups.
E: Where did half that bottle of voddy go?
K: Umm your hot cup.
E: OOOOOOOoooo you are right.