BWI (busing while intoxicated): Riding any form of public transportation while under the influence of alcohol or other (less legal) drugs. BWI is usually identified by the telltale scent of the intoxicating substance and its associated bizarre, antisocial, or otherwise transit-unfriendly behavior. (See also: bus foul, trife, Seahawks Special)

You can find more transit-inspired language in the bus rider’s glossary.