When something gets you excited or makes you feel happier than you were before; something that doesnt bother you
it means when something turns into something else, it changes.
The pizza is a metaphor for something you thought you wanted, but turns out to be something different, and not at all as good as you expected. In fact, it turns out to be fake, and you are angry at yourself for wanting it in the first place.
If something "turns up," it just means that it happens suddenly. You might say someone turns up also, if they show up without warning.
It means to do it with great care and caution. You do something tentatively because you are not sure about the result, hence you have to be extra careful, and ready to stop if it turns bad.
When something melts it turns into a liquid
it doesn't always mean that you did something wrong, they just wanted to explore their sexuality a little.
Your face usually turns red when you are embarrassed, so this phrase means that someone was ashamed of something.
it means when something turns into something else, it changes.
Solidify
I think that it means that he likes you, but doesn't really want you to know it!
Your body turns it into energy.
Freezing or solidifying.