The experience of both hallucinations and seizures, the combination of which can prove to be both terrifying and life threatening. Usually experienced as the result of withdrawals form diverse and massive quantities of a range of various psychoactive substances or from being unable to see your best friend/idol for a whole two days.
Then there was that time when I stopped mainlining Heroin mixed with vodka while snorting cocaine cut with methamphetamine and smoking hash and crack joints dipped in formaldehyde. The halluceizures were really serious. Also: I miss Lindsay so much that I'm starting to get halluceizures.