"cx" does not have a literal meaning it more represents a typed facial expression. It represents a happy/surprised face.
Well, CX means standardCXL = LimitedCXS = Super
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Cx means a big smile face, if you turn to the side, you could see it.
Cx means
Cervix
110
cx means xx it's a simple auto correct mistake !
If you mean slang as in internet slang, then it means "Certified Old Fart".
Garrett mean in cockney slang
Slang is slang It's the s' "LANG " uage.
In old slang, milkshake mean butt.
Cool itself, unless you are using it to mean mildly cold, is a slang word. Just because it is old slang doesn't mean that it is not still slang.