The placement of one's foot behind his head during a sexual act. Usually preformed while having sex in the doggy style position. It has been said that if done correctly the other sexual partner will BIG O continuously for one minute. P.S. attempt with CAUTION
"ur mum gey"
"no u"
"ur mum the big gey"
"no u"
"UR MUM THE MEGA BIG SUPER GEY"
*dies in huge ball of death rolling down a volcano with lava all over it and spikes*