According to Twitch, "hoodie horror" apparently revolves around teenagers wearing hoodies to disguise their faces. I can only think of one film off the top of my head that could be considered hoodie horror (I won't reveal the name, as it would actually be kind of a spoiler), but thanks to Twitch and Frightfest I now know of two.
Having received rave reviews at Frightfest this year, F follows a teacher who, following an attack by a student, has been left in a very emotionally fragile state. One day, after an argument with his daughter in detention, he finds himself trapped and the school under attack by a hooded assailant.
The trailer below is definitely sharp, though for some reason it lacks dialogue. Whether this is a choice by those who cut the trailer or simply a glitch is anyone's guess, it's definitely worth a look. Claimed by director Johannes Roberts to be a loose remake of Assault on Precinct 13, F stars David Schofield, Eliza Bennett, Ruth Gemmell, Juliet Aubrey and Emma Cleasby. Check it out courtesy of Twitch after the cut.