The phrase "good horror flick" refers to a movie that is scary, thrilling, and well done. It is a film that effectively frightens and entertains its audience. Full definition
Last good horror flick before this; Devils Rejects. (metacritic.com)
It was also a rip - roaring good horror flick that has stood the test of time for nearly 50 years for being ahead of its time (in part due to the lead character Ben (played by Duane Jones) being black, but also in terms of narrative and filmmaking style). (rowthree.com)
The Conjuring 2 looks like it aims to deliver scares and chills to anyone who wants a good horror flick. (slickstermagazine.com)