A Shanghai Yum Yum is a semen-filled doughnut.

The Shanghai Yum Yum is typically achieved by cutting a small hole into a plain doughnut before a willing female masturbates their partner into said doughnut (usually while stimulating the prostate with the deft use of a little finger) thus filling it with jizz. The female will then immediately eat the Yum Yum as it is best served warm.
How did your Tinder date go?

Pretty good, she let me give her a Shanghai Yum Yum.
by CFTRW April 7, 2017
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