Can i expunge a cl c misdemeanor for a hot check? and what and how serious is a cl c misdemeanor?

You didn't say where you were. In Texas a cl "C" misdemeanor is like a traffic ticket. If you were charged and or convicted of it then it will be on your criminal history for life. About the only thing you can do is request the court to seal or expunge it from your record. You should contact an attorney first to find out what reasons are acceptable to the court for this action. So it is possible but may not be easy depending on cirstances. It never hurts to try so good luck.