When one is sitting on the toilet and flatulence is released, which causes the water in the toilet to ripple.
Raspberry being related to the noise made when blowing with tongue stuck out of mouth to simulate a 'fart' and ripple due to the rippling of the water.
"Phwoar! You were in there a long time Dave!"
"Yeh I know! It was a corker! I let off a few raspberry ripples while on the bog
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