Abbreviation of Dilophosaurus, the venomous dinosaur from Jurassic Park and slang for sexual move.
To give a 'dilo' one releases an umbrella behind the head at the point of ejaculation into recipient's face to give the illusion of the creature's deadly attack. A screech is optional but advised.
The dilo is largely theory based.
"I just dropped a dilo on Claire with your Mum's brolly. "
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