2. To fall asleep, especially for a long time or after a lengthy drive. See the Wavy Gravy book. Somewhere in there. About hot water, scaling a mountain, and red ants.
3. Basically, the system is down.
After a long night of raving, Nick realised how stupid and uncool he was for tying a glowstick around his penis and dancing to "Cotton Eye Joe." He went back to his room and crashed. The next morning, Nick killed himself.
See Strong Bad E-mails.
Many CRASH cases are still unsolved, and the LAPD is imfamous for hiding any inciminating files.