The way you are using it is not common usage in American English. We start letters with "Dear" and maybe a grandmother calls someone "dear" but that is pretty much it. So it sounds awkward to the American ear even though it rhymes.
Less than reg. Only people from India, Indonesia and asia call people Dear informally. In north america old people use Dear as a name for their close loved ones, or Dear, as the beginning of an informal letter, so this is where I believe the confusion on the use of this english term came from. I cant tell you how many times people on here start their message with Hello Dear, its so annoying
Actually i will develop this site to make people laugh I did not want appraisal of this domain name and i had posted this thread in domain name section but a MOD moved in the appraisal section and gave me a gift
"you" "hey you" "buddy" "pal" LOL (these are funny but the closest I can think since we just don't speak that way) I am not really sure the exact idiom that means what you are trying to say. I think the equivalent for "cheer dear" would be something like "smile buddy" - but to be honest I am not sure what it means to you, so it is hard to give you an American equivalent.