A drug used for the treatment of depression, anxiety and obsessive-compulsive disorder. Due to a few isolated incidences of suicide, it is sometimes considered the most harmful drug on the planet, mostly by people who have none of the mentioned disorders and are under the delusion that sufferers can change their brain chemistry just by thinking it.
Describes a euphoric experience, often food-related, quite similar to an orgasm. Usually used by women, as for most men there is nothing better than sex. Such an assertion will often precede a lengthy debate on whether the expression is accurate.
A slightly more musical way of saying "insanity". It was once an accepted medical term, but like "retarded" and "dwarf" it has fallen by the wayside. The word derives from the belief that mental illness is somehow related to the phases of the moon, a conviction widely held until it was debunked by the advent of modern medicine.
"I shall have to invent a new form of lunacy for you." Dr. Seward to Renfield, Bram Stoker's Dracula