The female version of 'Pokey bum wank'. To poke one's self in the bottom to increase pleasure, whilst masturbating.
Think i'll just stay in tonight and have a pokey bum strum.
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The act of a female giving herself a shocker! (Two in the pink, one in the stink)
A way of spicing up your basic daily masturbation for a special occasion
Jean gets bored of the plain old strum, so every so often she throws in a Pokey Bum Strum to keep herself excited