When someone is devious, they are really goofy and has no filter. You can be walking by a daycare and ur homie says smash and points at one of the kids. That nigga's devious.
person 1: I'd 100% smash that 5yr old over there if it was legal
person 2: Nigga shut yo black devious goofy dingleberry scrambunctious ass up you finna go to jail bro no cap devious ahh nigga
When you talk about devious you mainly talk about the non-fictional Ozan Sherif, he has also played in alot of Turkish movies his biggest roles were as an antagonist ruining the lives of children (Rohan) this is why many call him "Devious".