Bloxing

A sex position, often preformed in a similar motion as how 69 would be preformed, but instead of going for the genitals you go straight for the asshole.

Jack: “So, what did you and Zoe get up to last night?”
Matt: “Not much, just ended up bloxing.”
Jack: “Is bloxing any good? Might have to try it out with my girl sometime..”