Bay slang... it means how many people can ride on those short yellow buses.. also means goin dumb, gettin hyphy, stupid, and retarded... Popularized by The Federation's single "18 Dummy", hence the name.
by iLuVnArU March 20, 2006
by iLuVnArU January 02, 2006
by iLuVnArU March 24, 2006