A combination of the words "jerk and more", meaning a person is a jerk and more. (For the definition of "more", see words such as asshat, off brand, etc.)
someone who is being a total ass and doesn't quite know it though it is obvious to everyone else.
1) "Mike, you are such a Jerkanoff! I can't beilive you'd make your girlfriend bring barbecue sauce for you to the fair and you don't even thank her for it!"
2) Telling him that he sucked at his solo was such a jerkanoff thing to do! He doesn't have any confidence in himself anyway!
Someone who only wishes to speak to like minded people and judge anyone outside this mindset as inferior.
Mostly done by Leftists, Progressives / Social Justice Warriors and the mentally ill.