What is Scotsman's leg up?

When you put one leg up on the toilet to face fuck a girl while chugging a case of IRN BRU.

MAN1:"My girl was over last night."
MAN2:"Oh really? What did you two do?"
MAN1:"I gave her the old Scotsman's leg up!"
MAN2:"Noice!"

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Scotsman's leg up - video