PWC

Personal Water Craft. AKA "lake lice", "jet ski", "skidoo" (the latter two actually brand names).

Small, overpowered, noisy watercraft owned by people who like showing off. The two-stroke engined versions can cause more pollution in one hour than a car can in its lifetime. Dangerous to paddlers when in the hands of showoffs, drunks and generally irresponsible people.