The phrase "big bad wolf" refers to a powerful and scary character, often seen as the villain in fairy tales like "Little Red Riding Hood." Full definition
Big Bad Wolves offers a bold and brilliantly realized effort. (maddwolf.com)
The movie begins in a kind of mouse orphanage, whose overseer tries to scare her charges with tales not of big bad wolves but big bad bears. (rogerebert.com)
Marr showed danger for anti Corbynites: they play him up as big bad wolf, he comes across rather mild, they look shrill (totalpolitics.com)