Plank

To plank: to have a planned wank. Being planned will involve some sort of preparation eg tissues ready, computer, 'special sites' etc

John: What are you doing tonight Will?
Will: I'm going to have a crafty plank, parents are out...
John: You sly dog.

or

Man A: I'm so stressed at the moment!
Man B: Why dont you have a plank tonight?
Man A: What's that?
Man B: *whispers in ear*
Man A: What, even with cushions and the lot? What a great idea, thanks bud!

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