Short for "love boat," aka
PCP (phencyclidine) or another
PCP-analog, such as 3-MeO-
PCP. Powerful dissociative anesthetic. Boat can also refer to freebase DXM (dextromethorphan), like the RoboTablet variety, as it is much, much stronger than traditional DXM, easily providing PCP-grade psychoses through relatively microscopic doses.
When you drive the love boat there's a very good chance you'll wake up in a hospital bed with cuts all over you and muscle soreness.