To the intellectual bad ass it is a more effective and more offensive way to say someone is a jerk. Jerkwagons tend to seem nice at first, but then turn around to slap you in the face...with their wagon, that they carry all their bullshit in.
Person 1: Hey how's it goin??
Person 2: Pretty good, haven't seen you for a while! You?
Person 1: Same, hey want to hang out later?
*Person 2 is offline*
Person 1: Wow, what a jerkwagon.
Harry: Bellatrix killed Sirius! My last living family!! *cries*
Ron: Sorry mate, that bitch is a jerkwagon.
A long night of cramming on procrastinated studying and homework; such as that 3 page English paper you were supposed to write about the history and development of poetry, your presentation on humanity for AP Psych and studying for your Spanish, Math and Chemistry tests. Which leaves you rolling out of bed the next morning feeling like total shit as if you had participated in a long night of drinking. Resulting in your hangover like feeling you experience the next morning. Symptoms include: extreme fatigue, headache, sore body and limbs, and hallucinations of the piles of homework yet to be done covering your room in all directions.
Joe: Man, I have the worst Homework Hangover ever. I stayed up til 4:00 this morning finishing my final project.
Hailie: Ugh, this Homework Hangover is even worse than the real hangover I had last week!