1. A non-consensual form of Plums in the oven.
2. Probably some sort of pudding.
"I was with Josh the other night, and he suddenly gave me a Plum Surprise."
"No way. What an asshole."
"That's what he said."
by Plummy Mummy July 12, 2010
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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.

SMACK

Exposer:MR PLUMS SURPRISE!!!!!
by snatchbandit February 11, 2010
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