Where inserting ones penis into anothers anus you become attatched to them and are unable to relieve yourself from that particular orafice without a hospital visit.
Potentially the world's most dangerous wrestling maneuver, perfected in Belgium in the late 18th century by Shaolin Gypsies. The technique itself is shrouded in mystery, the most recent known practitioner of the Bumlock is William Roache who plays Ken Barlow in Coronation street. Currently outlawed by all Professional wrestling Organisations because of its Brutal Nature.
A sex possition, two dicks required for this one, like a reverse scissor move, both dicks enter the other person's anus at the same time making double penetration for the pair... three way cyberian bum lock is called the clapping bum-shuffle.