When someone undeservingly stumbles upon success, through sheer luck and usually minimal skill of their own, similar to that of the cartoon character
Scooby Doo who would often catch the villain by
literally stumbling upon them, usually after he had fallen over or been involved in some sort of zany
accident.
Person 1: Hey, how'd you go in that exam?
Person
2: Dude I got like 95%
Person 1: How? I got like 65% and you told me you didn't even
study
Person
2: It's the Scooby Doo Effect man.