Shagged rigid
The point during female orgasm where leg muscles become tense and straighten the legs feet and toes into a rigid mass. It is very unwise, at this point of events, to stop the actions that are causing this rigidity.
"Well Fiona how did you fair with Rodney last evening?"
"Oh my God Alisia, he was charming an I was shagged rigid all night"
"Oh my God Alisia, he was charming an I was shagged rigid all night"