By: Addison Wylie Tammy is the latest instalment in a series of movies featuring Melissa McCarthy acting inappropriately.  It garnered her an Academy Award nomination in Bridesmaids, it repelled good taste in Identity Thief, and brought in lots of giggles in The Heat. Now, her rude persuasiveness finds its way in the backwoods.  Tammy, which embraces its hickabilly fog, has McCarthy playing the title role and hitting the road with her blunt, booze gulping grandma…