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Well, yeah, but that doesn't mean that there are messages hidden like "lol". It means there are things hidden in there. Like FedEx, If you will look closely, you will see an arrow hidden somewhere.
Art for the sake of art. Little to no deep meanig or hidden messages.
Cryptology is literally the study of hidden writing, and its modern application is the study of codes and ciphers.
'Classify the following expressions'
Do you mean non-verbal communication, as in body language (i.e., folding arms if uncomfortable with company), expressive dance, and/or facial expressions (which are often universal across cultures) or the peripheral nervous system, which sends messages throughout the body by motor neurons and receives messages by sensory neurons, all mediated by interneurons.
Dreams of killing almost always are exaggerated expressions of anger that you have not been able to express. These dreams are a lot like the common expressions we use, such as, "I could just kill him!" or "My mom's going to skin me alive!" In the same way that these expressions are never meant to be taken literally, dreams of killing provide dramatic but harmless release of emotional tension.
Nothing. The correct idiom is "ace in the hole," which literally means that you have an ace card (the highest value in the deck) hidden away somewhere so you can win the card game. It's come to mean any situation where you have a hidden advantage or something you can "pull out" to win the situation.
lkr
Literally "died of laughing"; usually used as a synomym of "LOL" (laughing out loud) among youngters, and abbreviated "mdr" in text messages.
9x+39
Apartment
What does Stone mean by the hidden stories in numbers