A Certified demon is someone that exudes stereotypical "alpha/sigma" male behaviour or exudes behaviour that can be considered menacing or threatening in both a positive and negative connotation.
Person 1: "Did you see how Harold got the best grade on the test without even studying?"
Person 2: "Yeah he's a certified demon for that."
Person 2: "Yeah he's a certified demon for that."
by ShadowGoldGang January 18, 2022