What is Hotcold?
1.
The feeling experienced in your mouth when eating soup that hasn't been microwaved fully.
or
The feeling on your body when swimming in a lake and a hot flush of water rushes past you.
"Whooaaa Buddy!, did you just feel that Hotcold go past?"
"MUM!! You didn't microwave my oxtail soup properly, theres all kinds of Hotcolds happening in my mouth"
See