The act of dissecting a fish, removing its organs, using it as a fleshlight through its mouth, experiencing sexual pleasure as the tip of the penis brushes against the inner gills of the fish.

Origin: This act is named after the person himself, yu shijie, who became well known in Japan for this disturbing act.
Mike Chang loves to yu shijie the fishes he bought at the market.
by MikeChang69 August 24, 2015
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