while having sex with your girl friend you grab a wet towl and then proceed to snap it against her snatch. The resulting sting turns her clam into a very soar piece of sushi.

Variations:

yellow stingray sushi - pee on the wet towel first

brown stingray sushi - shat on the wet towel first

A euphemism for “kill me” now that composting oneself after one’s death has become popular.