An Obligatory Psychotic Jackass refers to somebody who is self-elected as the rude, obnoxious and possible bully of the school. An example of this is Logan Echolls off the fictional television show “Veronica Mars”
VERONICA MARS: And let’s not forget Logan Echolls. Every school has an obligatory psychotic jackass. He’s ours.
YOU: "Oh my god! Look at that guy! He's a total obligatory psychotic jackass!"
ME: "Yeah, he acts like early season one Logan Echolls!"
Ivar wanted to let his friends know that he was drinking and beeing all cool, but lowkey. So he uploaded a picture of a vodka bottle and a package of digestive cookies, and said that the digestive cookies were obligatory, therefore Obligatory Digestive.
No matter how funny, good, intelligent or rare a video/picture/post is, there will always be someone disliking it, and if it's only for the sake of preventing a 'perfect' voting. Also, downvotes arise from jealousy, hate or any other form of secret respect.
person 1: dude check out this video, its a child doing a backflip while making pancakeson the back of an elephant.
person 2: wow thats incredible. *obligatory downvote*
person 1: i cant believe there is actually nobody that dislikes this newsfeed. well, its about a migrated disabled kid that survived cancer and the war.