Sid's Mum
Sid's Mum is a sexual position which originated in India. It is a sexual position where a guy called Sid calls over his friends to his house and then his friends shout "Sid's Mum", which leads to Sid's Mum running over to Sid's bedroom and proceeding in a group orgy with his friend's on his bed.
Hey Sid, can we try out a Sid's Mum next time? It'll be such a good experience for all of us!