Not so hot also is a way of saying that you do not really like something.

VOA: special.2009.12.06

I mean, I can do it now because it's pretty hot.

我的意思是，因为现在很热，所以我可以练。

喜欢曲棍球 - SpeakingMax英语口语达人

so it's hot yoga. So I can't really do that.

很热的瑜伽。所以在这里没法子练。

喜欢曲棍球 - SpeakingMax英语口语达人

A hot shot is a person, often a young person, who thinks he can do anything.

VOA: special.2009.12.06

They could better handle hot,dry climates because they do not have a lot of wool.

VOA: special.2009.08.03

Do this when the weather is not too hot and not too cold.

VOA: special.2009.04.28