Indecent Exposure as you have described would be a Class B Misdemeanor which can carry up to six months in jail and a fine up to $500, unless it involved a child witnessing the nudity in which case it would be a Class A Misdemeanor which can carry up to eleven months and twenty nine days in jail and a fine up to $2,500. Indecent exposure is defined in Tennessee Code Annotated 39-13-511, which you can read at http://www.lexisnexis.com/hottopics/tncode/. What sentence you are likely to be facing, assuming they can prove the case, is going to be dependent on many factors including: age, prior criminal history, employment, circumstances of this instance, etc. I would advise you to seek the legal help of an attorney in your area so that you can be prepared to fully defend yourself in court.
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With an attorney that handles these types of charges, you're likely looking at dismissal or diversion. You'll want this charge expunged thereafter.
I am not your attorney nor is any answer I may provide legal advice. You may contact me directly for legal advice only if you are a resident of Tennessee insofar as I only practice in Tennessee.