a sexual act in which your partner does a handstand behind you facing your backside, while you secure the legs, they pull your penis backward between your legs and start a fellatio while maintaining the handstand and grip
Natch maintained the Lock And Chain on Flint for a full 6 hours immortalizing him in the Guinness book of world records. when quotes the following was said
reporter:how did you do it? was there a lot of rigorous training?
natch: he likes handstands, and he loves dick, so no it was second nature for the both of us