someone or something that is acting like an idiot, a tool, a dumbie, someone who is whining too much, something that is not working correctly, a bad driver, similar to the word "gay" but not so politically incorrect. You can call people or things tranny and you won't offend anyone.
"GGRR!! My phone isn't working, it's being SO TRANNY!"
"Dude, why you acting so tranny?"