This means your cat could be coming into it's heat.
When the cat purrs and wags its tail, it is very happy to see you.
The animal is content and happy
ive heard it means they are happy to see you
Snakes will vibrate their tails as a warning. In this case it would mean that the female snake does not want the male to approach, and may see him as a threat.
If he wags it and is panting, he is most likely happy. If he is wagging it straight in the air, hunched over, and growling/snarling, he's pissed.
"astute" and "acuminous" are fairly close to "knowledgeable" in meaning.
It is probably purring but if not, you might wanna take it to the vet
This is called bruxing, and it has a similar meaning to a cat purring.
It is a system of signalling. Probably best known from using devices such as flags for sending signals
It means that the cat is purring very loudly, like a boat's motor.
It means it likes you, or wants something. It is generally thought purring is a sign of contentment, or relaxation.
If by chills you mean it vibrates when you pet it that's a good thing it's like purring
When someone is said to be wagging their tongue, that means they are talking about someone else and probably saying things that aren't true. A dog wagging it's tail is showing it is happy and not talking about someone.