When you walk around a corner, typically in a building with many people(school,bank,foodlion,popeyes chicken(lots of black people there)walmart, ect)and you head just so happens to fall right into a pair of unsuspecting breasts and jiggles around in them for about 5.7 seconds or longer.
Dude! I was walking out of third period and turned the corner too sharp and ran into this big boobed slut and had and Acidental Motorboat,it was amazing!
How a boo-boo occurred dat you didn't mean to commit but were high on LSD at da time.
Hallucinogenic drugs aside, AlexanderGraham Bell is said to have "acidentally" spilled caustic battery-fluid on his pants just before uttering da famous "first words spoken over a telephone", but this is a myth.