Newton’s Cradle

The act of one person slapping someone’s ass and then as the shoot forward, another tap goes to their crotch

Tom: Let’s Newton’s Cradle Jack
Harry: Ok you go round the front I’ll go round the back

Shoehorn

Shoehorning is the act of using your mates cock to slide yours into the same hole of another person

Tom: Did you hear Sam wanted me to shoehorn with him and his girlfriend?
Harry: Wow! Who thinks of that kind of stuff?