It's usually a sign of pain or of holding back an emotional outburst.
It simply means that they want you to lay
I love you or I like you...
means that they just got caught in a lie or bluffin.
don't know but it happened to one of my knuckles and it is really sore
A fist pound is when you make a fist and bump it against the other person's fist, or beat your fist against something.
There is no fist desk but you could mean fist deck. In which case:It can be a Fist Deck skateboard (Toy Machine brand).
a fist or a strong fist
Tattoos of stars on knuckles can have different meanings to them. They can have a nautical meaning or they can just be decorative.
I think you mean,,"Don't bite the hand that feeds you". It means, don't turn on someone that is good to you. If someone is nice to you or provides you with positive things, don't ignore them or give them a reason to stop.
The meaning of "You cannot shake hands with a clenched fist" is that you cannot hold anger when trying to compromise or make peace with the other people. A clenched fist is a sign of anger and shaking hands usually means to approach someone peacefully.
That person is likely either signifying willpower, brotherhood or strength, or he is dying of a heart attack.
This is not an idiom. "Rapped" means struck sharply, and your "knuckles" are the joints of the fingers. Someone is getting a sharp snap of something (usually a ruler) to the back of their hands, which hurts! In the old days, teachers used this punishment when a child would misbehave in class.