Part 'oblivious' and part 'idiot', an "oblidiot" is a term first coined to describe idiot drivers who are also completely oblivious to others who may be driving near them in traffic. More recently, the term has adopted a more generic definition to describe those who are simply "oblivious idiots".
Hey, look at this oblidiot! She just swerved across two lanes without looking and cut right in front of me to get in this lane. There were signs for the past 2 miles warning that there was a toll coming up! And here we sit, while she sorts through her purse looking for change. Oh wait! Now she's opened the car door to look on the pavement for some change! Ah! I can't believe it...now she's popped the trunk open! In the tollway booth! Unbelievable!!
Someone who stops in the middle of the aisle in the supermarket blocking the way with their trolley so nobody can get past and not even realise it. Can be applied to many similar situations.
Those who are amongst the ranks of Fallout fans who believe New Vegas is the be all-end all of the series, and will venomously, and maniacally defend their stance with the ferocity of Chricj Crocker defending Britney Spears while screaming into a webcam. These neckbeard adorned cock goblins are also known for screaming "drones " before launching into a badly spelled rant that you have to struggle up understand.
Matt: Holy shit, Tony's such an obsidiot.
Kevin: That emo kid needs to wash his hair.