|1.||Mr Plums Surprise|
the exposure of male genitalia in a public place, most commonly public transport. Eg a train, bus, taxi etc...
The first person to then notice this unusual display then gets a slap and "MR PLUMS SURPRISE" shouted loudly at their face.
Person: hey john, that guy has his balls out.
Exposer:MR PLUMS SURPRISE!!!!!