The tendency to encounter situations in which the opposing entity displays an unreasonable and unusual level of incompetence.
Person 1: Wow, how in the world does Quinn have such a high k/d this game? He is trash at the game normally, seems kinda sus to me.
Person 2: Nah dude it's not him, it's just the Quinn Effect in action.
Parson 1: Ohhhhh, that makes much more sense.
When you poop so hard it ricochets off the bowl and hits the underside of the toilet seat.
There was evidence of the Erin Quinn Effect all over back bath.