Literally it means that you have a heart, you physically possess that bodily organ.
"Blue blood" LITERALLY means blood that is blue in color.
It means find that part in the heart, tell what it has, and what it is.
An idiom is something that does not mean what the phrase says literally, so yes. You can't actually laugh your head off.
This is not an idiom. They mean that someone literally has a tapeworm inside their intestines. It's a parasitic organism.
It is an idiom, because one cannot literally be drunk with pleasure, only with alcohol. The key feature of an idiom is that it's not interpreted literally.
"Pu'uwai" in Hawaiian means "heart." It refers to both the physical organ and the metaphorical concept of the heart as the center of emotions and feelings.
you have broken somone's heart means to hurt someone feelings.
Unless there is truly something wrong with your heart, then yes, it is an idiom. My heart fell, my heart exploded, my heart sang, my heart doing anything other than pumping blood is an analogy and an idiom.
It means you feel very strong of someone
An idiom usually is a sentence, or part of one. It certainly can be used as part of a sentence. The way to tell if it's an idiom is if it makes sense the way it's literally written.
Nothing. I think you may mean "mend fences," which literally means to repair or fix the broken spots in a fence. Used as an idiom, it would mean to fix or repair a "broken" relationship by apologizing, compromising, and communicating.
I'm not familiar with that as an idiom, so I imagine it means literally throwing jelly at someone.