A combination of "sadistic" and "discipline". What the abusive Gerald Strickland frequently indulged in while self-servingly carrying out his duties as school principal of Hill Valley High.
Gerald Strickland's disgracefully autocratical behavior (not to mention his blatant hypocrisy, such as making a huge noisy offended show of disapproving of Biff's drinking, yet he himself was a closet alcoholic) towards the teens under his authority was obviously just sadiscipline --- he didn't really care about his students; he just craved a constant power-trip.
by QuacksO August 21, 2019