What does it mean when a guy says, ''that's hot''?

Maggie916
Okay during gym we were playing this game guard the pin, dodge ball and guarding a pin combined. So this guy Kasey, started throwing the balls at the pins on our side and if he knocked them all down that meant our team would loose. Well he started knocking them down and I picked them back up and he knocked them back down. We ended up loosing and I got made because I don't like loosing so I started throwing the dodge balls at him. I cornered him a a started chucking balls at him but missed, but I threw one last one and it hit him in the face and I finally quit because I got what I wanted, to hit him because he lost the game for us. So as soon I left my friends tell he that when I left he said ''that's hot.'' I didn't hear him say that but what does that mean? I know him pretty since 6th grade when I moved and well he's kind of like a guy version of me. Help was it a harmless complement or like was he turned on somehow when I got made, HELP!!
What does it mean when a guy says, ''that's hot''?
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