1. A nap at an awkward time of day or night which leaves one feeling much worse than before the nap.
2. A nap that leaves one feeling cracked out.
"I accidentially fell asleep at 7:00 last night, and when I woke up from my crack-nap at 9:30, I felt shitty so didn't know if I should eat soomething or just go back to sleep."
A cracknappa is a person who has no abilities in any fields and is completely and utterly useless. This person will more often than not be a noob also.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).