Past-tense of the first letter of the word Fuck.
see also: F'd up.
1.) A state in which one's mind is altered by the oral ingestion or nasal inhalation of crushed "Focalin," a form of Adderall. Usually identified by cotton mouth, a sense of urgency about anything unknown, an overwhelming euphoria during which all is excusable, an immense increase in energy, enhanced sensory skills, slowed motor skills, intense concentration on the subject at hand, enlightenment, an urge to have a "deep talk" with anyone around, and a slight sense of sobriety as a result. May also be accompanied by the urge to smoke (a) cigarettes (if a smoker), the loss of appetite, and the frequency of urination.