Feet In The Air
The position women's feet are often in during sex in the missionary and other positions.
Last night was a real "Feet In The Air" marathon for her. I sure would like to see her Feet In The Air.
put your feet up
COMMON If you put your feet up, you have a rest, especially by sitting down somewhere comfortable. All these dishes can be oven-baked from frozen, while you put your feet up and relax. Why don't you put your feet up for a moment and rest?
cut the ground from under someone's feet
do something which leaves someone without a reason or justification for their actions or opinions. informal
leg up
1. Literally, a boost from another person that enables one to reach something that one could not reach on one's own. Give me a leg up so I can reach the dishes on the top shelf.
2. An advantage in a situation or over another person. Getting certifications will definitely give you a leg up in the IT industry. I knew I had a leg up on my opponent when I saw that he was struggling to counter my opening moves.
turn/stand something on its head
to make people think about something in the opposite way to the way it was originally intended
The attorney quickly turned his main defense argument on its head.