In the setup for this broad comedy, an ineffectual New York science teacher (Roy Haylock) transfers to a hick Texas high school, where he’s promptly fired for being gay. He regains his confidence and his job after resurfacing in drag as Bianca Del Rio, a tart-tongued spitfire with bee-stung lips who aims to teach the locals a thing or two both inside and outside the classroom. Crowd-funded on a teensy budget, the movie is not without its charms, including Ryan Matthieu Smith’s inventive production and costume design and a cast of unknowns who prove worthy straight men to Del Rio. Matt Kugelman wrote and directed, with an affinity for camp; there are cameos by Alan Cumming, Sandra Cho, and RuPaul.