when a man recieves fellatio while concurrently excreting fecal matter in a pool, or any large body of water. Both subjects must be submerged in the water, except for whoever is on the recieving end may have thier head out of the water. Defecation must be executed underwater as well. Recieving a blumpkin at the edge of a pool and, say, letting the shit just fall into the pool does not constitue as blumpkin diving.

A goth who has been part of the subculture since it originally came about, or a goth over the age of 40.