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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"
by RICHARD LUNDIE August 17, 2007
 
2.
The feeling you get when some of your body is really hot and some of it is freezing.
Last night when I went to bed, my body was completely hotcold; my fingers were like icicles, but I was sweating because my chest was so hot.
by Jane Jacobs May 25, 2011
 
3.
Diarrhea, Montezuma’s Revenge, the excrement of feces after a long night of Mexican food and Natural Light. When one has a cold this is the only warming part therein. Like removing the drain plug at the jiffy lube, 10-W30 is just pouring out. The violent fury from ones rectum. Pile it on high and deep.
Your food looks like a hot cold.
by Walrus8 April 23, 2007